拉幕广告v1.4

//
// curtain advertising v1.4 power by coudly copyright
//
var _first = document.body.firstChild;
while(_first.nodeType!=1){_first = _first.nextSibling;}
var curtain = document.createElement("DIV");
curtain.style.height = "500px";
curtain.style.width = "960px";
curtain.style.margin = "0 auto 0";
curtain.style.backgroundImage = "url(guoqing.jpg)";
curtain.draw = function(){
var H = this.clientHeight;
if(H
this.style