function showmenu(baseID, divID) {
    baseID = document.getElementById(baseID);
    divID = document.getElementById(divID);
    if (showmenu.timer) clearTimeout(showmenu.timer);
    hideCur();
    divID.style.display = 'block';
    showmenu.cur = divID;
    if (!divID.isCreate) {
        divID.isCreate = true;
        divID.onmouseover = function() {
            if (showmenu.timer) clearTimeout(showmenu.timer);
            hideCur();
            divID.style.display = 'block';
        };
        function hide() {
            showmenu.timer = setTimeout(function() {
                divID.style.display = 'none';
            }
            , 1000);
        }
        divID.onmouseout = hide;
        baseID.onmouseout = hide;
    }
    function hideCur() {
        showmenu.cur && (showmenu.cur.style.display = 'none');
    }
}


var coursewho;
var courseDiv;
function showCourse(myObj,num){
var obj=document.getElementById(num)
	if(coursewho){
		coursewho.className="x11"
		courseDiv.style.display="none"
	}
	myObj.className="x22"
	obj.style.display="block"
	coursewho=myObj
	courseDiv=obj
}