var allPageTags = new Array();
var allPageTags = document.getElementsByTagName("ul");

function showMenu(theMenuItem)
{
	el = document.getElementById("sub_"+theMenuItem);
	if(el){
		current = (el.style.display=="none") ? true : false;

		for (i=0; i<allPageTags.length; i++)
		{
			if (allPageTags[i].className=="menu_subitem")
			{
				allPageTags[i].style.display="none";
			}
		}

		if (current == true)
		{
			document.getElementById("sub_"+theMenuItem).style.display = "block";
		}
	}
}