function IsValueNull(value)
{
  if (value==null||value=="")
    { 
        return true;
    }
  else
    {
        return false;
    }
}
function IsValueNullInitial(value, len)
{
  value = value.substring(len,value.length);
  if (value==null||value=="")
    { 
        return true;
    }
  else
    {
        return false;
    }
}

function IsValidEmail(value)
{
  if (IsValueNull(value))
    { 
        return false;
    }
  else
    {
        if (IsEmailStringValid(value)==false)
        {
            return false;
        }    
        return true;
    }
}

function IsValidEmailInitial(value,len)
{
value = value.substring(len,value.length);
  if (IsValueNull(value))
    { 
        return false;
    }
  else
    {
        if (IsEmailStringValid(value)==false)
        {
            return false;
        }    
        return true;
    }
}

function IsEmailStringValid(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					
	}
	

function IsDropDownSelectionValid(controlname,defaultvalue)
{
    var cbo = document.getElementById(controlname);
    var Index = cbo.selectedIndex;
    var value = cbo.options[Index].text;
    if (value==defaultvalue)
        { 
            return false;
        }
    else
        {
            return true;
        }
}	
	
function IsInteger(s)
{   var i;
    if(IsValueNull(s))
        return false;
    else
    {
        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 Trim(s)
{   
    return stringToTrim.replace(/^\s+|\s+$/g,"");
}

function LTrim(stringToTrim) {
	return stringToTrim.replace(/^\s+/,"");
}
function RTrim(stringToTrim) {
	return stringToTrim.replace(/\s+$/,"");
}

function checkInternationalPhone(strPhone)
{
    // Declaring required variables
    var digits = "0123456789";
    // non-digit characters which are allowed in phone numbers
    var phoneNumberDelimiters = "()- ";
    // characters which are allowed in international phone numbers
    // (a leading + is OK)
    var validWorldPhoneChars = phoneNumberDelimiters + "+";
    // Minimum no of digits in an international phone no.
    var minDigitsInIPhoneNumber = 8;

    var bracket=3
    //strPhone=ltrim(rtrim(strPhone))
    if(strPhone.indexOf("+")>1) return false
    if(strPhone.indexOf("-")!=-1)bracket=bracket+1
    if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
    var brchr=strPhone.indexOf("(")
    if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
    if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
    s=stripCharsInBag(strPhone,validWorldPhoneChars);
    return (IsInteger(s) && s.length >= minDigitsInIPhoneNumber);
}
function checkInternationalPhoneInitial(strPhone,len)
{
strPhone = strPhone.substring(len,strPhone.length);
    // Declaring required variables
    var digits = "0123456789";
    // non-digit characters which are allowed in phone numbers
    var phoneNumberDelimiters = "()- ";
    // characters which are allowed in international phone numbers
    // (a leading + is OK)
    var validWorldPhoneChars = phoneNumberDelimiters + "+";
    // Minimum no of digits in an international phone no.
    var minDigitsInIPhoneNumber = 8;

    var bracket=3
    //strPhone=ltrim(rtrim(strPhone))
    if(strPhone.indexOf("+")>1) return false
    if(strPhone.indexOf("-")!=-1)bracket=bracket+1
    if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
    var brchr=strPhone.indexOf("(")
    if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
    if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
    s=stripCharsInBag(strPhone,validWorldPhoneChars);
    return (IsInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function IsNumeric(strString)
   //  check for valid numeric strings	
   {
   var strValidChars = "0123456789.-";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
   {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
      {
            return false;
      }
      else
      {
        if(strChar=="." || strChar=="-")
        {
            if(NoOfOccurance(strString,strChar)>1) 
                return false;
        }
      }
   }
   return true;
}

function NoOfOccurance(value,search)
{
    var _c = 0;
    for (var i=0;i<value.length;i++) {
        if (search == value.substr(i,search.length))
            _c++;
    }
    return _c; 
}

function IsMSIE()
{
//alert("Test1");
if (/MSIE (\d+\.\d+);/.test(navigator.userAgent))
    return true;
else
    return false;
}
function IsMozila()
{
////alert("TestMo");
if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent))
    return true;
else
    return false;
}