//½ûÖ¹¹öÂÖ
function DoNothing() 
{   
    return false;
}
function NoColl()
{
    document.ns = navigator.appName == "Microsoft Internet Explorer";
    if(document.ns) 
    {
        var oColl = document.all.tags("Select");
        var i = oColl.length-1;
        for(i; i >= 0 ; i--)
        {
            var oObj = oColl[i];
            if(!oObj.onmousewheel)
            {
                oObj.onmousewheel = DoNothing;
            }
        }
    }
}