//プリロード
var staticImg, activeImg;
window.onload = preload;

function preload(){
staticImg = new Image();
staticImg.src = "./img/common/gnav_hs_off.gif","./img/common/gnav_js_off.gif","./img/common/gnav_pe_off.gif","./img/common/gnav_fe_off.gif";
activeImg = new Image();
activeImg.src = "./img/common/gnav_hs_on.gif","./img/common/gnav_js_on.gif","./img/common/gnav_pe_on.gif","./img/common/gnav_fe_on.gif";
}

//ロールオーバー
$(function(){
	$("img.over").hover(
		function(){
			var activeImg = $(this).attr("src").replace("_off","_on");
			$(this).attr("src",activeImg);
		},
		function(){
			var staticImg = $(this).attr("src").replace("_on","_off");
			$(this).attr("src",staticImg);
		}
	);
});