function showlayer(layer){
	var myLayer = document.getElementById(layer);
	var myLayerImg = document.getElementById(layer + '_img');
	if(myLayer.style.display=="none" || myLayer.style.display==""){
		myLayer.style.display="block";
	myLayerImg.style.backgroundImage = "url(/img/css/arrow-down.gif)";
	} else {
		myLayer.style.display="none";
		myLayerImg.style.backgroundImage = "url(/img/css/arrow-more.gif)";
	}
}