/*=========================================================


	SHANGHAI
	YIHUANG DESIGN & ASSOCIATES LTD.
	H-WANG.COM
	Email design@h-wang.com 
	Tel +86 21 51879118
	For more information of Design & Branding


==========================================================*/


$(function(){
	var image_cache = new Object();

	$("img.btn").each(function(i){
		var imgsrc = this.src;
		var dot = this.src.lastIndexOf(".");
		var imgsrc_on = this.src.substr(0, dot) + "_o" + this.src.substr(dot, 4);
		image_cache[this.src] = new Image();
		image_cache[this.src].src = imgsrc_on;

		$(this).hover(
			function(){ this.src = imgsrc_on;},
			function(){ this.src = imgsrc;}
		);

	});
})