var timeout
dom = (document.getElementById)? true : false;
nn4 = (document.layers)? true : false;
ie4 = (document.all && !dom)? true : false;

function show(what){
	if(dom){
	hideAll();
	document.getElementById(what).style.visibility = "visible";}
	else if(ie4){
	hideAll();
	document.all[what].style.visibility = "visible";}
	else if(nn4){
	hideAll();
	document.layers[what].visibility = "show";
	}
                   }

function hideAll(){
	if(dom){
	document.getElementById('submenu_about').style.visibility = "hidden";
	document.getElementById('submenu_news').style.visibility = "hidden";
	document.getElementById('submenu_service').style.visibility = "hidden";
	document.getElementById('submenu_techspecs').style.visibility = "hidden";
	}
	else if(ie4){
	document.all['submenu_about'].style.visibility = "hidden";
	document.all['submenu_news'].style.visibility = "hidden";
	document.all['submenu_service'].style.visibility = "hidden";
	document.all['submenu_techspecs'].style.visibility = "hidden";
	}
	else if(nn4){
	document.layers['submenu0'].visibility = "show";
	document.layers['submenu_about'].visibility = "hide";
	document.layers['submenu_news'].visibility = "hide";
	document.layers['submenu_service'].visibility = "hide";
	document.layers['submenu_techspecs'].visibility = "hide";
	}
                  }