function validateEmail(obj){
		var str = obj.value;
		var patn = /^[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]*)*@[a-zA-Z0-9\-]+([\.][a-zA-Z0-9\-]+)+$/;
		if(patn.test(str)){
  		  return 0;
		}else{
   		 return 1; //incorrect format
		}
	}

function isWhitespace (s){   // Is s empty?
     var reWhitespace = /^\s+$/ ;
    
     return (reWhitespace.test(s) || (s == null) || (s.length == 0));
}

function isWhitespaceinStr (s){   // Is s empty?
     var whitespace = " \t\n\r";

       var i;
    var returnString = "";

    // Search through string's characters one by one.
    // If character is not in whitespace, return false otherwise true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (whitespace.indexOf(c) != -1) return true;
    }

    return false;
}