function checkAMPM(obj, theField)
{
 var result = true;
 if (obj.value=="") {return true};
 var d=obj.value.match(/^(\d{1,2}):(\d{1,2})[am|pm|AM|PM]{2}$/);
 if(!d || d[1]*1>12 || d[2]*1>59)
 {
  alert(' \"'+theField+'\" field should be in this form: hh:mm[am/pm] (no space after minutes. Eg: 1:05am)');
  obj.focus();
  return (false);
 }
 return (true);
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789.");
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function validNum(formField,fieldLabel,required)
{
	var result = true;
      if (formField.value=="") return true;
	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}

var dtCh= "/";
var minYear=1900;
var maxYear=2100;

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 isDate(dtStr,fieldLabel){
	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){
		alert('The date format for the "' + fieldLabel +'" field should be: mm/dd/yyyy.');
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert('Please enter a valid month for the "' + fieldLabel +'" field.');
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert('Please enter a valid day for the "' + fieldLabel +'" field.');
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert('Please enter a valid year for the "' + fieldLabel +'" field.');
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert('Please enter a valid date for the "' + fieldLabel +'" field.');
		return false
	}
return true
}

function validDate(formField,fieldLabel)
{
 var result = true;
 if (formField.value=="") return true;
 if (isDate(formField.value,fieldLabel)==false){
 formField.focus()
 return false
 }
return true
}

function isEmailAddr(email)
  {
   var result = false
   if (email=="") {return true;}
   var theStr = new String(email)
   var index = theStr.indexOf("@");
   if (index > 0)
   {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
   }
   return result;
  }