function putFocus(formInst, elementInst)
{
  if (document.forms.length > 0)
  {
    document.forms[formInst].elements[elementInst].focus();
  }
}

function confirmDelete()
{
  var confirmation = confirm("Are you sure you want to delete this item?");
  if (confirmation == true){ return true;}
  else {return false;}
}	

var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}

// --------------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// --------------------------------------------

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// --------------------------------------------
//                  msg
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
// --------------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// --------------------------------------------

var proceed = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  if (!elem.firstChild) return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", "ERROR: required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//            validateGeneral
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validateGeneral(valfield,   // element to be validated
                         infofield,
                         required ) // id of element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//            validateTextOnly
// Validate if something has been entered and is file friendly
// Returns true if so 
// --------------------------------------------

function validateTextOnly  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";
  for (var i = 0; i < valfield.value.length; i++)
  {
    if (iChars.indexOf(valfield.value.charAt(i)) != -1)
    {                
      msg (infofield, "warn", "ERROR: Please enter text only");                
      return false;
    }
  }
  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//            validateTextOnlyNoSpaces
// Validate if something has been entered and is file friendly
// Returns true if so 
// --------------------------------------------

function validateTextOnlyNoSpaces  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var iChars = "\ !@#$%^&*()+=-[]\\\';,./{}|\\\":<>?";
  for (var i = 0; i < valfield.value.length; i++)
  {
    if (iChars.indexOf(valfield.value.charAt(i)) != -1)
    {                
      msg (infofield, "warn", "ERROR: Please enter text only without spaces");                
      return false;
    }
  }
  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//            validatePresentS
// Validate if select box value not equal to 0 
// Returns true if so 
// --------------------------------------------

function validatePresentS  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var iChars = "-";
  for (var i = 0; i < valfield.value.length; i++)
  {
    if (iChars.indexOf(valfield.value.charAt(i)) != -1)
    {                
      msg (infofield, "error", "ERROR: required");                
      return false;
    }
  }
  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//            validateNumber
// Validate if something has been entered and is file friendly
// Returns true if so 
// --------------------------------------------

function validateNumber  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var rank = /^[0-9]$/  ;
  if (!rank.test(tfld)) {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  msg (infofield, "warn", "");
  return true;
}


function validateRank    (valfield,   // element to be validated
                         infofield,
                         required)  // id of element to receive info/error msg                            
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  if( isNaN(valfield.value ))
  {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  msg (infofield, "warn", "");
  return true;
}

function validateRank2    (valfield,   // element to be validated
                         infofield,
                         required)  // id of element to receive info/error msg                            
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  if( isNaN(valfield.value ))
  {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<2) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>2)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    
      msg (infofield, "warn", "");
  }
  return true;
}

function validateRank3    (valfield,   // element to be validated
                         infofield,
                         required)  // id of element to receive info/error msg                            
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  if( isNaN(valfield.value ))
  {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<3) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>3)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    
      msg (infofield, "warn", "");
  }
  return true;
}

function validateRank5    (valfield,   // element to be validated
                         infofield,
                         required)  // id of element to receive info/error msg                            
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  if( isNaN(valfield.value ))
  {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<5) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>5)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    
      msg (infofield, "warn", "");
  }
  return true;
}

function validateRank6    (valfield,   // element to be validated
                         infofield,
                         required)  // id of element to receive info/error msg                            
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  if( isNaN(valfield.value ))
  {
    msg (infofield, "error", "ERROR: Please enter numbers");
    setfocus(valfield);
    return false;
  }
  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>6)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    
      msg (infofield, "warn", "");
  }
  return true;
}



// --------------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid e-mail address");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "Unusual e-mail address - check if correct");
  else
    msg (infofield, "warn", "");
  return true;
}


// --------------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// --------------------------------------------

function validateTelnr  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, "warn", "");
  }
  return true;
}

// --------------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// --------------------------------------------

function validateAge    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", "Older than 110: check correct");
  else {
    if (tfld<7) msg (infofield, "warn", "Bit young for this, aren't you?");
    else        msg (infofield, "warn", "");
  }
  return true;
}
  

  function isInteger(s)
  {
    var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
  }

  function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
  }

  function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
  }
  function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this;
  }  

function validateDate  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off  
  var dtStr = tfld;
   
  var dtCh= "/";
        var minYear=1900;
        var maxYear=2200; 
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		msg (infofield, "warn", "The date format should be : mm/dd/yyyy");		
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		msg (infofield, "warn", "Please enter a valid month");		
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		msg (infofield, "warn", "Please enter a valid day");		
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		msg (infofield, "warn", "Please enter a valid 4 digit year between "+minYear+" and "+maxYear);		
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		msg (infofield, "warn", "Please enter a valid date");		
		return false;
	}
  msg (infofield, "warn", "");
  return true;
}