$(document).ready(function(){
	//マウスオーバー
	setBtnMouseOver();
});

function setBtnMouseOver(){
	$("a img.over").each(function() {
		var off = this.src;
		var dot = this.src.lastIndexOf('.');
		var on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
		var img = $("<img>").attr({
			src: on
		});
		$(this).hover(
			function() { this.src = on; },
			function() { this.src = off; }
		);
	});
}