var regTag=/^[0-9a-zA-Z_]+$/;
//var regSrch=/^[0-9a-zA-Z_()-:!/]+$/;
function isNull(aStr)
{
	var index;		
	for (index=0; index < aStr.length; index++)
		if (aStr.charAt(index) != ' ')
			return false;
	return true;
}
function trim(str)
{
    s = str.replace(/^(\s)*/, '');
    s = s.replace(/(\s)*$/, '');
    return s;
}
//For checking invalid E-Mail address
function isEmail(aStr)
{
	var reEmail=/^[0-9a-zA-Z_'\.-]+\@[0-9a-zA-Z_\.-]+\.[0-9a-zA-Z_\.-]+$/;
	if(!reEmail.test(aStr))
	{
		return false;
	}
	return true;
}
/*function isNumeric(value)
{
	var regNumeric=/^[0-9]+$/;
	if(!regNumeric.test(value))
	{
		return false;
	}
	return true;
}*/
function IsNumeric(strString)
   	{
	   var strValidChars = "0123456789-";
	   var strChar;
	   var blnResult = true;
	
	   if (strString.length == 0) return false;
	
	   for (i = 0; i < strString.length && blnResult == true; i++)
	   {
			strChar = strString.charAt(i);
		 	if (strValidChars.indexOf(strChar) == -1)
			{
				blnResult = false;
			}
		}
	   	return blnResult;
	}

//For checking invalid web address
function isWebAddress(aStr)
{
	var reWeb=/^[0-9a-zA-Z_'\.-]+\.[0-9a-zA-Z_\.-]+$/;
	if(!reWeb.test(aStr))
	{
		return false;
	}
	return true;
}
function checkDate(dt)
{
	var reg = new RegExp("[0-9]{1,2}/[0-9]{1,2}/[0-9]{4}");
	if(reg.test(dt))
	{
		var datepart = dt.split("/");
		
		for(i=0;i<datepart.length;i++)
			datepart[i] = parseInt(parseFloat(datepart[i]));
			
		if(datepart[1] < 1 || datepart[1] > 31 || datepart[0] < 1 || datepart[0] > 12)
		{
			return false;
		}
		else if((datepart[0] == 4 || datepart[0] == 6 || datepart[0] == 9 || datepart[0] == 11) && datepart[1] == 31)
		{
			return false;	
		}
		else if(datepart[0] == 2)
		{
			if(datepart[1] > 29)
				return false;
			if(!LeapYear(datepart[2]) && datepart[1] == 29)
				return false;
		}
		return true;						
	}
	return false;			
}
function LeapYear(intYear) {
	if (intYear % 100 == 0) {
		if (intYear % 400 == 0) { return true; }
	}
	else { 
		if ((intYear % 4) == 0) { return true; }
	}
	return false;
}
function compareDates(dt1,dt2)
{
	var datepart1 = dt1.split("/");
	var datepart2 = dt2.split("/");
		
	for(i=0;i<datepart1.length;i++)
	{
		datepart1[i] = parseInt(parseFloat(datepart1[i]));
		datepart2[i] = parseInt(parseFloat(datepart2[i]));		
	}	
	
	if(datepart1[2] > datepart2[2])
		return 1;
	else if(datepart1[2] < datepart2[2])	 
		return -1;
	else if(datepart2[2] == datepart1[2])	 	
	{
		if(datepart1[0] > datepart2[0])
			return 1;
		else if(datepart1[0] < datepart2[0])	
			return -1;
		else if(datepart1[0] == datepart2[0])					 
		{
			if(datepart1[1] > datepart2[1])
				return 1;
			else if(datepart1[1] < datepart2[1])	
				return -1;			
		}
	}
	return 0;	
}
function changeDateFormat(dt)
{
	var datepart  = new Array(3);		
	var datepart        = dt.split("-");        	
	return (datepart[0]+"/"+datepart[1]+"/"+datepart[2]);	
}
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 dtCh= "/";
var minYear=1900;
var maxYear=2100;
	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
}