whitespace = "\t \n\r";
function isEmptyString(s)
{
    var i;
	if((s == null) || (s.length == 0)) return true;
	for(i=0;i < s.length;i++)
	{
		var currchar = s.charAt(i);
		if(whitespace.indexOf(currchar) == -1) return false;
	}
	return true;
}

All_numbers = "1234567890";
function isAnyNumber_Check(s)
{
    var i;
	for(i=0;i < s.length;i++)
	{
		var currchar = s.charAt(i);
		if(All_numbers.indexOf(currchar) != -1) return true;
	}
	return false;
}

function isNotNumeric(s)
{
	if(isNaN(s))
	{
		return(true);
	}
	return(false);
}

function isEmail(n)
{
		if ((n==null) || (n.length==0))
		{
			return true;
		}
		if (isEmptyString(n)) return false;
		var i=1;
		var nLength=n.length;
		while((parseInt(i) < parseInt(nLength)) && (n.charAt(parseInt(i)) != '@'))
		{
			i++;
		}
		if ((parseInt(i) >= parseInt(nLength)) || (n.charAt(i)!="@"))
		{
			return false;	
		}	
		else i+=2;
		while((i<nLength) && (n.charAt(i)!="."))
		{
			i++;
		}
		if ((i>=nLength-1) || (n.charAt(i)!="."))
		{
			return false;	
		}	
		else return true;		
}

extArray = new Array(".gif",".jpg",".jpeg",".jpe");
function Allowed_Uploaded_Files(File_Value)
{
	allowSubmit = false;
	if (!File_Value)
	{
		return true;
	}
	while (File_Value.indexOf("\\") != -1)
	{
		File_Value = File_Value.slice(File_Value.indexOf("\\") + 1);
	}
	ext = File_Value.slice(File_Value.indexOf(".")).toLowerCase();
	for (var i = 0; i < extArray.length; i++)
	{
		if (extArray[i] == ext)
		{
			allowSubmit = true;
			break;
		}
	}
	if (allowSubmit)
	{
		return true;
	}
	else
	{
		return false;
	}
}
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){
	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 should be : mm-dd-yyyy");
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month");
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day");
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("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("Please enter a valid date");
		return false;
	}
return true;
}