var activeLayer;
var timer;
var timeout=1000;
function showLayer(id){
	stopTimer();
	if(activeLayer!=document.getElementById(id)){
		hideLayer();
		activeLayer=document.getElementById(id);
		activeLayer.style.visibility = "visible";
	}
}
function hideLayer(){
	if(activeLayer){
		activeLayer.style.visibility = "hidden";
		activeLayer=null;
	}
}
function startTimer(){
	timer=setTimeout("hideLayer()", timeout);
}
function stopTimer(){
	clearTimeout(timer);
}


function showTab(page, tab){
	pages=document.getElementsByClassName("tab");
	for(i=0; i<pages.length; i++){
		pages[i].style.display="none";
	}
	tabs=$("item_tabs").getElementsByTagName("li");
	for(i=0; i<tabs.length; i++){
		tabs[i].style.backgroundColor="";
		tabs[i].style.color="";
	}
	tab.style.backgroundColor="#234979";
	tab.style.color="#fff";
	
	$(page).style.display="";
	
}