function menuFix() {
    var sfEls = document.getElementById("nav").getElementsByTagName("li");
    for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmouseover=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onMouseDown=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onMouseUp=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"),"");
        }
    }
    
    //¹öÂÖËõ·Å
    var imgObj; 
    for( i = 0; i < document.getElementsByTagName("img").length; i++ )
    {
        imgObj = document.getElementsByTagName("img")[i];
        //alert(imgObj.name);
        if(imgObj.name != "noimg")
        {
            imgObj.onmousewheel = function img_zoom()  
            { 
                var zoom = parseInt(this.style.zoom, 10) || 100; 
                zoom += event.wheelDelta / 12; 
                if (zoom> 0)¡¡this.style.zoom = zoom + "%"; 
                return false; 
            }
        } 
    }
}
window.onload=menuFix;