$(document).ready(function(){
	
	$("#menu >li[id^='roll'] >a").mouseover(function () {
        imgsrc = $(this).children("img").attr("src");
        matches = imgsrc.match(/.png/);
        if (matches) {
            imgsrcON = imgsrc.replace(/.png$/gi, "-ok.png");
            $(this).children("img").attr("src", imgsrcON);
        }
	});
	
	$("#menu >li[id^='roll'] >a").mouseout(function () {
        imgsrc = $(this).children("img").attr("src");
        matches = imgsrc.match(/.png/);
        if (matches) {
            imgsrcON = imgsrc.replace(/-ok.png$/gi, ".png");
            $(this).children("img").attr("src", imgsrcON);
        }
	});
	
});