//显示菜单
function ShowHideMenu_show(elmnt)
{
	document.getElementById(elmnt).style.visibility="visible";
}
//隐藏菜单
function ShowHideMenu_hide(elmnt)
{
	document.getElementById(elmnt).style.visibility="hidden";
}
//鼠标指针进入改变背景颜色
function changeOverBG(obj){
        obj.style.backgroundColor="#C4E8FF";        
}
//鼠标指针出改变背景颜色
function changeOutBG(obj){
        obj.style.backgroundColor="#FFFFFF";
}