function randomBg(){	
var randombgs=["images/pic1.jpg", "images/pic2.jpg", "images/pic3.jpg","images/pic4.jpg","images/pic5.jpg"];
this.document.getElementById("ban").style.background='#FFFFFF url("'+randombgs[Math.floor(Math.random()*randombgs.length)]+'") no-repeat 0 0 scroll';
}

function innerban(){	
var randombgs=["images/ipic1.jpg", "images/ipic2.jpg", "images/ipic3.jpg","images/ipic4.jpg","images/ipic5.jpg"];
this.document.getElementById("baninn").style.background='#FFFFFF url("'+randombgs[Math.floor(Math.random()*randombgs.length)]+'") no-repeat 0 0 scroll';
}