// DETECTOR DE BROWSER //
var dom = document.getElementById ? true:false;
var nn4 = document.layers ? true:false;
var ie4 = document.all ? true:false;

function solapa(x){
		ocultar();
		if(ie4){
			document.all['solapa'+x].style.visibility="visible";
		}
		else if(nn4){
			document.layers['solapa'+x].visibility="visible";
		}
		else if(dom){
			document.getElementById('solapa'+x).style.visibility="visible";
		}
}

function ocultar(){
		if(ie4){
			for (var i=1; i<4; i++) {
				document.all['solapa'+i].style.visibility="hidden";
			}
		}
		else if(nn4){
			for (var i=1; i<4; i++) {
				document.layers['solapa'+i].visibility="hidden";
			}
		}
		else if(dom){
			for (var i=1; i<4; i++) {
				document.getElementById('solapa'+i).style.visibility="hidden";
			}
		}
}

/* BOTON MARQUESINA */

function play(x){
		ocultar2();
		if(ie4){
			document.all['play'+x].style.visibility="visible";
		}
		else if(nn4){
			document.layers['play'+x].visibility="visible";
		}
		else if(dom){
			document.getElementById('play'+x).style.visibility="visible";
		}
}

function ocultar2(){
		if(ie4){
			for (var i=1; i<3; i++) {
				document.all['play'+i].style.visibility="hidden";
			}
		}
		else if(nn4){
			for (var i=1; i<3; i++) {
				document.layers['play'+i].visibility="hidden";
			}
		}
		else if(dom){
			for (var i=1; i<3; i++) {
				document.getElementById('play'+i).style.visibility="hidden";
			}
		}
}