isamap = new Object();
isamap[0] = "_df"
isamap[1] = "_ov"
function isimgact(id, act){
	if(document.images) document.images[id].src = eval( "isimages." + id + isamap[act] + ".src");}
	if (document.images) {
isimages = new Object();
isimages.top1_df = new Image();
isimages.top1_df.src = "images/menu3_01.jpg";
isimages.top1_ov = new Image();
isimages.top1_ov.src = "images/menu3_02.jpg";
isimages.top2_df = new Image();
isimages.top2_df.src = "images/menu3_04.jpg";
isimages.top2_ov = new Image();
isimages.top2_ov.src = "images/menu3_03.jpg";}