function random(){
var ramimage = new Array("img/mainImg01.jpg","img/mainImg03.jpg","img/mainImg04.jpg","img/mainImg05.jpg","img/mainImg06.jpg");
var dd = new Date();
var sec = dd.getSeconds()
var curimg = ramimage[sec % ramimage.length];
document.write("<img src=\"" + curimg + "\" WIDTH=\"547\" HEIGHT=\"311\">");
}