/**
	* DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
	*/
	// Declaring valid date character, minimum year and maximum year
	var dtCh= "/";
	var minYear=1800;
	var maxYear=2010;

	function isNumberUnder20(s){
		if (s.value != parseInt(s.value) || s.value < 1 || s.value > 20) {
			return false; }
		return true;
	}

	function isNumberUnder4(s){
		if (s.value != parseInt(s.value) || s.value < 1 || s.value > 4) {
			return false;
		}
		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 isDate(dtStr){
		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){
			//return 'The date format should be : mm/dd/yyyy';
			return false
		}
		if (strMonth.length<1 || month<1 || month>12){
			//return 'Please enter a valid month';
			return false
		}
		if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
			//return 'Please enter a valid day';
			return false
		}
		if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
			//return '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){
			//return 'Please enter a valid date';
			return false
		}
		return true
	}


	/*********************************************
	*
	*	CHECKING CONTENT OF FORM ELEMENTS 
	*
	*********************************************/

	function WithoutContent(ss) {
		if(ss.length > 0) { return false; }
		return true; }

	function NoneWithContent(ss) {
		for(var i = 0; i < ss.length; i++) {
			if(ss[i].value.length > 0) { return false; }
			}
		return true; }

	function NoneWithCheck(ss) {
		for(var i = 0; i < ss.length; i++) {
			if(ss[i].checked) { return false; }
			}
		return true; }

	function WithoutCheck(ss) {
		if(ss.checked) { return false; }
		return true; }

	function WithoutSelectionValue(ss) {
		for(var i = 0; i < ss.length; i++) {
			if(ss[i].selected) {
				if(ss[i].value.length) { return false; }
				}
			}
		return true; }
		
		
		
	function isValidEmail(str) {

			var at="@"
			var dot="."
			var lat=str.indexOf(at)
			var lstr=str.length
			var ldot=str.indexOf(dot)
			if (str.indexOf(at)==-1){
			return false }

			if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
			return false }

			if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
				return false }

			if (str.indexOf(at,(lat+1))!=-1){
				return false }

			if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
				return false }

			if (str.indexOf(dot,(lat+2))==-1){
				return false }

			if (str.indexOf(" ")!=-1){
				return false }

 			return true					
		}