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, nmStr){
			var daysInMonth = DaysArray(12);
			var pos1=dtStr.indexOf(dtCh);
			var pos2=dtStr.indexOf(dtCh,pos1+1);
			var strDay=dtStr.substring(0,pos1);
			var strMonth=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(nmStr + ": The date format should be : dd/mm/yyyy");;
				return false;
			}
			if (strMonth.length<1 || month<1 || month>12){
				alert(nmStr + ": Please enter a valid month");
				return false;
			}
			if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
				alert(nmStr + ": Please enter a valid day");
				return false;
			}
			if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
				alert(nmStr + ": 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){
				alert(nmStr + ": Please enter a valid date");
				return false;
			}
			return true;
		}

		function isBlank(s) {
			//returns true if only white space is in 's'
			for (var i=0; i < s.length; i++) {
				var c = s.charAt(i);
				if ((c != " ") && (c != "\n") && (c != "\t")) return false;
			}
			return true;
		}