var rotate_delay = 2000; // delay in milliseconds (5000 = 5 secs)
	var current = 0;
	
	function next()
	{
		if (num_imagenes > 0)
		{
			if (current < num_imagenes - 1)
			{
				document.getElementById("imagen1").href = showimagenes[++current];
				document.getElementById("imagen2").src = imagenes[current];
			}
			else
				first();
		}
	}

	function previous()
	{
		if (num_imagenes > 0)
		{
			if (current - 1 >= 0)
			{
				document.getElementById("imagen1").href = showimagenes[--current];
				document.getElementById("imagen2").src = imagenes[current];
			}
			else
				last();
		}
	}

	function first()
	{
		if (num_imagenes > 0)
		{
			current = 0;
			document.getElementById("imagen1").href = showimagenes[0];
			document.getElementById("imagen2").src = imagenes[0];
		}
	}

	function last()
	{
		current = num_imagenes - 1;
		document.getElementById("imagen1").href = showimagenes[current];
		document.getElementById("imagen2").src = imagenes[current];
	}

	function ap(text)
	{
		if (num_imagenes > 0)
		{
			document.getElementById("slidebutton").value = (document.getElementById("slidebutton").value == "Parar") ? "Empezar" : "Parar";
			if (document.getElementById("slidebutton").value == "Empezar")
				document.getElementById("slidebutton").className = "boton stop";
			else
				document.getElementById("slidebutton").className = "boton play";
			rotate();
		}
	}
	
	function rotate()
	{
		if (document.getElementById("slidebutton").value == "Empezar")
		{
			current = (current == num_imagenes - 1) ? 0 : current + 1;
			document.getElementById("imagen1").href = showimagenes[current];
			document.getElementById("imagen2").src = imagenes[current];
			window.setTimeout("rotate()", rotate_delay);
		}
	}