function rdpic(){};
var rdpic=new rdpic();
var number=0;
rdpic[number++]="banner_1.jpg"
rdpic[number++]="banner_2.jpg"
rdpic[number++]="banner_3.jpg"
rdpic[number++]="banner_4.jpg"
var rdnum=Math.floor(Math.random()*number);
if(document.getElementById('banner_img')){
document.getElementById('banner_img').style.background='url(../media/profile/common/'+rdpic[rdnum]+') no-repeat'
}