// JScript 文件

var div_body = document.getElementById("div_body2");
div_body.style.display = "none";
setInterval(function (){
	if (document.documentElement.clientHeight > 600){
        div_body.style.marginTop = parseInt(document.documentElement.clientHeight-600)/2 + "px";
		div_body.style.display = "";
	}else{
		div_body.style.marginTop = "0px";
		div_body.style.display = "";
	}
}, 1)