var timer = null;
					
					function showMenu(obj) {
						if(timer) {
						    clearTimeout(timer);
						    timer = null;
						}

						var menu_layer = getMenu(obj);
						var menu_item = obj;
						if (menu_item == "show_nav") {
						    menu_layer.style.visibility="visible";
	    					menu_layer.style.display="block";
						    menu_layer.style.left = "204px";
						    menu_layer.style.top = "30px"; 
						}

						
						
					}

					function getMenu(obj) {
					  if(document.layers) {
					    return document.layers[obj];
					  } else if(document.all && !document.getElementById) {
						return document.all[obj];
					  } else if(document.getElementById) {
						return document.getElementById(obj);
						} else {
					   return null;
					  }
					}

					function hideMenu(obj) {

						var menu_layer = getMenu(obj);
 
						if(!menu_layer) {
							return;
						}

						if(document.layers) {
							menu_layer.visibility="hidden";
						} else {
							menu_layer.style.display="none";
							menu_layer.style.visibility="hidden";
						}

					}