function getStyle(id){return document.all[id].style;}
function HideLayer(id){getStyle(id).visibility = "hidden"; getStyle(id).display = "none";}
function ShowLayer(id){getStyle(id).visibility = "visible";getStyle(id).display = "block";}

function mostra(pai,filho){
	var f = eval(pai+'.offsetLeft');;
	var g = eval(filho+'.style');
//	alert(f)
		if (g.display == "" || g.display == "none"){
			g.left = f;
			ShowLayer(filho);
		}else{
			HideLayer(filho)
		}
}

/*******************************************************************************/
function roll(img_name, img_src){
   document[img_name].src = img_src;
}

/*******************************************************************************/