function moveit() //这个函数用于把层放到浏览器中间
{ var y = document.getElementById("bodydiv");
var x = document.getElementById("neirong");
if(x.offsetHeight<600){
	neirong.style.height=600+"px";
	}
if(y.offsetWidth>1000){
	container.style.marginLeft=(y.offsetWidth-1000)/2+"px";
	bjflash.style.marginLeft=(y.offsetWidth-1000)/2+"px";
	bodycss.style.backgroundPosition=(y.offsetWidth-1000)/2+"px";
	}else{
	container.style.marginLeft=0;
	bjflash.style.marginLeft=0;
	bodycss.style.backgroundPosition=0;
	
		}
}
window.onload=moveit; //网面打开时时执行moveit()
window.onresize=moveit; //当调整浏览器大小时执行moveit(