var MessageBox={
	cache:(function(){var p=new Image();p.src="http://img.itsogo.net/2009/messagebox.gif";})(),
	show:function(){
		var pos=this.GetPixPosition(402,203);
		document.getElementById("messagebox").style.top=pos[0];
		document.getElementById("messagebox").style.left=pos[1];
		document.getElementById("messagebox").style.display="";
	},
	hidden:function(){
		document.getElementById("messagebox").style.display="none";
	},
	mv:function(o){
		o.className="over";
	},
	mt:function(o){
		o.className="";
	},
	GetPixPosition:function (w,h){//获取绝对居中位置
		var myWidth = 0, myHeight = 0;
		if (typeof (window.innerWidth) == "number") {
				myWidth = window.innerWidth;
				myHeight = window.innerHeight;
			} else {
				if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
					myWidth = document.documentElement.clientWidth;
					myHeight = document.documentElement.clientHeight;
				} else {
					if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
						myWidth = document.body.clientWidth;
						myHeight = document.body.clientHeight;
					}
				}
			}
		var left =(myWidth - w) / 2+"px";
		var top =(myHeight - h) / 2 + document.documentElement.scrollTop+"px";
		return [top,left];
	}
};