function submenuhoverimg(obj,img) {
	obj.src=img;
	//obj.width='161';
	//obj.height='20';
	obj.style.marginTop='-1px';
}
function submenuunhoverimg(obj,img) {
	obj.src=img;
	//obj.width='160';
	//obj.height='19';
	obj.style.marginTop='1px';
}
window.onload=window.onscroll=window.onresize=divhover
function divhover() {
	var BtmTop = document.getElementById("Bottom").offsetTop;
	var cHgt = document.documentElement.clientHeight + document.documentElement.scrollTop;
	var DH = document.getElementById("hoverDiv").offsetHeight;
	var Btmdis;
	if (BtmTop < cHgt) {
		Btmdis = BtmTop - DH;
	} else {
		Btmdis = cHgt - DH;
	}
	document.getElementById("hoverDiv").style.top = Btmdis + "px";
	document.getElementById("hoverDiv").style.left = document.getElementById("Middle").offsetLeft + document.getElementById("Middle").offsetWidth - 100 + "px";
	
	//如果页面实在不够高则不显示
	if (document.getElementById("search").getBoundingClientRect().bottom > Btmdis) {
		document.getElementById("hoverDiv").style.display = "none";
	}
}