function random(){
var ramimage = new Array("img/key_top.jpg","img/key_top1.jpg","img/key_top2.jpg","img/key_top3.jpg");
var dd = new Date();
var sec = dd.getSeconds()
var curimg = ramimage[sec % ramimage.length];
document.write("<img src=\"" + curimg + "\" WIDTH=\"560\" HEIGHT=\"198\">");
}
random();