//Triming the leading spaces.
function trimspace(str)
{
  var len= str.length;
  if (len != 0)
  {
    for (var i=0;i<len;i++)
    {
      if(str.indexOf(" ")==0)
        str=str.substring(1,len);
    }
    strtrim=str;
  }
  else
  {
    strtrim=str;
  }
  return strtrim;
}

//Checking for the valid email address.
function checkmail(eAddr)
{
  var usEmail = true;
  var lenSuffix = (usEmail) ? 3 : 2;
  var result = false;
  var ndxAt =  0;
  var ndxDot =0;
  ndxAt  = eAddr.indexOf("@");
  ndxDot = eAddr.indexOf(".") ;
  ndxDot2 = eAddr.lastIndexOf(".") ;
  if ((ndxDot < 0) || (ndxAt < 0))
  {
    event.returnValue=false;
  }
  else if ( (ndxDot2 - 2) <= ndxAt)
  {
    event.returnValue=false;
  }
  else if (eAddr.length < ndxDot2 + lenSuffix)
  {
    event.returnValue=false;
  }
  else
  {
    return true;
  }
}
// checking is numeric value
function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;


   for (i = 0; i < sText.length && IsNumber == true; i++)
      {
      Char = sText.charAt(i);
      if (ValidChars.indexOf(Char) == -1)
         {
         IsNumber = false;
         }
      }
   return IsNumber;

   }
   
function alphanumeric(alphane)
{
	var numaric = alphane;
	for(var j=0; j<numaric.length; j++)
		{
		  var alphaa = numaric.charAt(j);
		  var hh = alphaa.charCodeAt(0);
		  if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123))
		  {
		  }
		else	{
			 return false;
		  }
		}
 return true;
}



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
}

function ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }