// function to remove the right and left spaces in a string
function trimSpaces(strValue) 
{
	var intNoOfCharctrs = strValue.length;
	var strLspace = "";	
	var strTrimmed="";
	strLspace=strValue;
	while (strLspace.charAt(0)==" ")
	{
		strLspace=strLspace.substring(1,intNoOfCharctrs);
	}
	strTrimmed=trimTrailingSpaces(strLspace);
	return strTrimmed;
}//end of trimSpaces() method


// function to remove the trainling spaces in a string
function trimTrailingSpaces(aValue) 
{
	var bValue=reverse(aValue); //pass the value to Reverse method
	var strValue = "";
	var retValue="";
	var intNoOfCharctrs = bValue.length;
	strValue=bValue;
	while (strValue.charAt(0)==" ")//checks whether the charceter is space
	{
		strValue=strValue.substring(1,intNoOfCharctrs);
	}
	strValue=reverse(strValue);
	return strValue;
}//end of trimTrailingSpaces() method

//Internally called in TrimTrailingSpaces, for reversing the String
function reverse(aValue)
{
	var intIndex;
	var strValue="";
	var intNoOfCharctrs = aValue.length;
	for (intIndex = 0; intIndex <=  intNoOfCharctrs; intIndex++)
	strValue = aValue.substring(intIndex, intIndex+1) + strValue;
	return strValue;//reverse the field value and send to again trailing space method
}//end of reverse() method

// METHOD FOR URLENCODING FOR A GIVEN VALUE
// this will return a urlencoded string for space and ampersand
function urlencode(s)
{
	var result = "";
	for(i=0;i<s.length;i++)
	{
		if(s.charAt(i) == " " )
		{
			result += "+";
		}
        else if(s.charAt(i) == "&")
		{
		    result +="%26"
		}
	    else
		{
			result += s.charAt(i);
		}
	}
	return result;
}
// end of urlencode() method


// METHOD FOR CHECKING THE EXISTANCE OF ANY SPECIAL CHARACTERS IN A STRING
// this will return false if any of the special characters are present in the string else returns true.
function checkSplChar(name){
 var splchar=new Array('/','*','%','-','!','@','#','$','%','^','&','+','|','=','{','}','[',']','<','>','\'','\"','\\','\,','.',';',':','~','`','(',')','?');

       for(i=0;i < name.length;i++)
          {
              for(j=0;j < splchar.length;j++)
                {
                    if(name.charAt(i)==splchar[j])
                       {
                           return false;
                        }
                }
          }
		  return true; 
}
// end of checkSplChar() method.

// METHOD FOR CHECKING THE EXISTANCE OF SELECTED SPECIAL CHARACTERS IN A STRING
// this will return false if any of the special characters are present in the string else returns true.
function checkSplChar_Few(name){
 var splchar=new Array('/','*','!','#','$','&','{','}','[',']','<','>','\'','\"',';',':','(',')','?','`');

       for(i=0;i < name.length;i++)
          {
              for(j=0;j < splchar.length;j++)
                {
                    if(name.charAt(i)==splchar[j])
                       {
                           return false;
                        }
                }
          }
		  return true; 
}
// end of checkSplChar_Few() method.

// METHOD FOR CHECKING THE EXISTANCE OF ANY SPECIAL CHARACTERS AND NUMBERS IN A STRING
// this will return false if any of the special characters and numbers are present in the string else returns true.
function checkSplChar_Num(name){
 var splchar=new Array('0','1','2','3','4','5','6','7','8','9','/','*','%','-','!','@','#','$','%','^','&','+','|','=','{','}','[',']','<','>','\'','\"','\\','\,','.',';',':','~','`','(',')','?');

       for(i=0;i < name.length;i++)
          {
              for(j=0;j < splchar.length;j++)
                {
                    if(name.charAt(i)==splchar[j])
                       {
                           return false;
                        }
                }
          }
		  return true; 
}
// end of checkSplChar_Num() method.




// METHOD FOR CHECKING THE BLANK SPACES IN A GIVEN STRING
// this will return false if any blank space exists else returns true.
function checkBlank(name){
	for(i=0;i < name.length;i++)
	{
		if(name.charAt(i) == " " )
		{
			return false;
		}
	}
	return true;
}
// END OF checkBlank() method.	

//VALIDATE EMAIL ADDRESS.......
function isEmail(email) 
{
  if ((email.indexOf('@', 0) == -1) || email.indexOf('.') == -1) 
  {
    return false;
  }
 else { return true; }
}



// Check the value is in Numeric or not
	function IsNumeric(str)	
	 {
	 	var no=true,i,s1;	
		var Chr = "0123456789";
		for (i = 0; i < str.length ; i++)
      	{ 
      		s1= str.charAt(i); 
      		if (Chr.indexOf(s1) == -1) 
         	{
         		no = false;
         	}
      	}
		if(no==false)
		{
			return false;
		}
		else
		{
			return true;
		}
	 }
	 
// start of date validation functions
	 
	
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

//function to check whether given string is integer or not
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 to check number of days in february
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 which returns the number of days in month
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 to check whether given date is valid or not
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
}
// end of date validation functions


// function to check if the string is a valid email id
function echeck(str) {

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

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}

// function to restrict the number of characters in a textarea
function textCounter(field,  maxlimit) {
if (field.value.length > maxlimit) 
	field.value = field.value.substring(0, maxlimit);
}