function IsBlank(obj) {
	if (obj) {
		var val = obj.value.replace(" ", "");
		if (val.length == 0) {return true;}
	}
	return false;
}

function IsEmail(obj, allowBlank){
	var s = new String(obj.value);
    var i = 1;
    var sLength = s.length;
    
    if (sLength==0) {return (allowBlank) ? true : false;} //check length
    while ((i < sLength) && (s.charAt(i) != "@")) {i++;} //find @
	
	if ((i >= sLength) || (s.charAt(i) != "@")) {return false;}
    else {i += 2;}
    
    while ((i < sLength) && (s.charAt(i) != ".")) {i++;}//find .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) {return false;}
	else {return true;}   
}