(function( $ ){

	$.fn.CheckEmpty = function() {
		var result = true;
		this.removeClass("my_validation_error");
		if (this.val().length == 0){
			this.addClass("my_validation_error");
			result = false;
		}
		return result;
	};
	
	$.fn.CheckNumber = function() {
		var result = true;
		this.removeClass("my_validation_error");
		if (this.val().match(/^\d+$/) == null){
			this.addClass("my_validation_error");
			result = false;
		}
		return result;
	};

	$.fn.CheckEmail = function() {
		var result = true;
		this.removeClass("my_validation_error");
		if (this.val().match(/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/) == null){
			this.addClass("my_validation_error");
			result = false;
		}
		return result;
	};
  
})( jQuery );