var a_imgs = new Array();
var currentImg = 0;

function open_visor(img)
{	
	
	document.getElementById('cubierta').className = "cubierta transparent";
	document.getElementById('sobrecubierta').className = "sobrecubierta";
	document.getElementById('marco').className = "marco";
	document.getElementById('imagen_visor').src = a_imgs[img];
	currentImg = img;
}

function close_visor()
{
	document.getElementById('cubierta').className = "oculto";
	document.getElementById('marco').className = "oculto";
	document.getElementById('sobrecubierta').className = "oculto";
	document.getElementById('imagen_visor').src = "";
}

function redimensiona(obj)
{
	margen = 7;
	altoControl = 35;
	
	image = new Image();
	image.src = obj.src;
	
	document.getElementById('visor').style.height = image.height+"px";
	document.getElementById('visor').style.width = image.width+"px";
	document.getElementById('marco').style.height = image.height+2*margen+altoControl+"px";
	document.getElementById('marco').style.width = image.width+2*margen+"px";

}

function nextImg()
{
	if(++currentImg >= a_imgs.length) currentImg = 0;
	document.getElementById('imagen_visor').src = a_imgs[currentImg];
}

function prevImg()
{
	if(--currentImg < 0) currentImg = a_imgs.length-1;
	document.getElementById('imagen_visor').src = a_imgs[currentImg];
}