var timer, i, menuId;
var dom = document.getElementById ? true : false;
var ie4 = ((document.all) && (!dom)) ? true : false;
var ns4 = document.layers ? true : false;
var opera = navigator.userAgent.indexOf('Opera') != -1 ? true : false;
var dhtml = dom ? true : ie4 ? true : ns4 ? true : false;

function setVisibility(element,newVisibility)
{
if (dhtml)
{
if (dom) document.getElementById(element).style.visibility = newVisibility;
else if (ie4) document.all[element].style.visibility = newVisibility;
else if (ns4) eval('document.' + element + '.visibility = newVisibility');
}
}

function menu()
{
if (dhtml)
{
if (opera) for (i = 1; i <= 5; i++) document.getElementById('hiddenMenu' + i).style.top = 75;
if (ie4) for (i = 1; i <= 5; i++) document.all['hiddenMenu' + i].style.top = 18;
setVisibility('menuHolder','visible');
}
}

function showMenu(id)
{
if (dhtml)
{
clearTimeout(timer);
for (i = 1; i <= 5; i++) if (i != id) setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + i,'hidden');
setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id,'visible');
}
}

function hideMenu(id)
{
if (dhtml)
{
menuId = (ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id;
timer = setTimeout("setVisibility(menuId,'hidden')",50);
}
}

function dontHideMenu()
{
if (dhtml) clearTimeout(timer);
}