// JScript 文件

    function a()
    {
        document.getElementById("aa").src = document.getElementById("aa").src + '?';
    }
    
    
    function toggle(targetid){
    if (document.getElementById){
        target=document.getElementById(targetid);
            if (target.style.display=="block"){
                target.style.display="none";
            } else {
                target.style.display="block";
            }
    }
}


 var timeout	= 100;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;