var img_width = "588";
var img_height = "219";
var img_title = "SQTECH";


var ad=new Array()
//insert here your images src
ad[0]='http://www.yilianyixue.com/images/js/01.jpg';
ad[1]='http://www.yilianyixue.com/images/js/02.jpg';
ad[2]='http://www.yilianyixue.com/images/js/03.jpg';
ad[3]='http://www.yilianyixue.com/images/js/04.jpg';
ad[4]='http://www.yilianyixue.com/images/js/05.jpg';
ad[5]='http://www.yilianyixue.com/images/js/06.jpg';

var xy=Math.floor(Math.random()*ad.length);
document.write('<img src="'+ad[xy]+'" width="'+img_width+'" height="'+img_height+'" alt="'+img_title+'">');