function validate_checkox(checkbox_array){	
		var is_checked = false;
		for (var i=0; i < checkbox_array.length; i++){
		  	 if (checkbox_array[i].checked){
				is_checked = true;
			  }
		 }
		 return is_checked;
	}
	
	function validateEmail(email){

		if(email.length <= 0)
		{
		  return false;
		}
		var splitted = email.match("^(.+)@(.+)$");
		if(splitted == null) return false;
		if(splitted[1] != null )
		{
		  var regexp_user=/^\"?[\w-_\.]*\"?$/;
		  if(splitted[1].match(regexp_user) == null) return false;
		}
		if(splitted[2] != null)
		{
		  var regexp_domain=/^[\w-\.]*\.[A-Za-z]{2,4}$/;
		  if(splitted[2].match(regexp_domain) == null) 
		  {
			var regexp_ip =/^\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]$/;
			if(splitted[2].match(regexp_ip) == null) return false;
		  }// if
		  return true;
		}
			return false;
	}
	
	function isNumber(str){
		if(isNaN(str)){
			return false;
		}else{
			return true;
		}
	}
	
	function trim(a) {
		return a.replace(/^s*(S*(s+S+)*)s*$/, "$1");
	}
	
var digits = "0123456789";
var phoneNumberDelimiters = "()-. ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 7;

	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++)
		{   
			// Check that current character isn't whitespace.
			var c = s.charAt(i);
			if (bag.indexOf(c) == -1) returnString += c;
		}
		return returnString;
	}
	
	function checkInternationalPhone(strPhone){
		s=stripCharsInBag(strPhone,validWorldPhoneChars);
		return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
	}