String.prototype.isEmail = function(){
							var re=/^.+@.+\..{2,3}$/;
							if(this.search(re)==-1)
								return false;
							return true;
					}
String.prototype.leftTrim = function(){
	var re = /\s*((\S+\s*)*)/;
	return this.replace(re, "$1");
}
String.prototype.rightTrim = function(){
	var re = /((\s*\S+)*)\s*/;
	return this.replace(re, "$1");
	
}
String.prototype.trim = function(){
	return this.rightTrim().leftTrim();
}