var timeout	= 1000;
var closetimer	= 0;
var ddmenuitem	= 0;
var IE7 = false;

IE7 = (navigator.appVersion.indexOf("MSIE 7.")==-1) ? false : true;

function mcloselast()
{
    if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

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

    // close old layer
    mcloselast();

    // 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;       

//function abortAJAX() {
//    var ajaxHandler = Sys.WebForms.PageRequestManager.getInstance();
//   if (ajaxHandler.get_isInAsyncPostBack) {
//        ajaxHandler.abortPostBack();
//    }
//}