var LastLeftID = "";
function menuFix() {
        var obj = document.getElementById("pageleftnav").getElementsByTagName("li");
       
        for (var i=0; i<obj.length; i++) {
               obj[i].onmouseover=function() {
                      this.className+=(this.className.length>0? " ": "") + "sfhover";
               }
               obj[i].onMouseDown=function() {
                      this.className+=(this.className.length>0? " ": "") + "sfhover";
               }
               obj[i].onMouseUp=function() {
                      this.className+=(this.className.length>0? " ": "") + "sfhover";
               }
               obj[i].onmouseout=function() {
                      this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"), "");
               }
        }
}
function DoMenu(emid)
{
        var obj = document.getElementById(emid);       
        obj.className = (obj.className.toLowerCase() == "expanded"?"collapsed":"expanded");
        if((LastLeftID!="")&&(emid!=LastLeftID))        //关闭上一个Menu
        {
               document.getElementById(LastLeftID).className = "collapsed";
        }
        LastLeftID = emid;
}