var rotate_delay = 2000; // delay in milliseconds (5000 = 5 secs)
	var current_plano = 0;

function next_plano()
		{
			if (num_planos > 0)
			{
				if (current_plano < num_planos - 1)
				{
					document.getElementById("plano1").href = showplanos[++current_plano];
					document.getElementById("plano2").src = planos[current_plano];
				}
				else
					first_plano();
			}
		}
	
		function previous_plano()
		{
			if (num_planos > 0)
			{
				if (current_plano - 1 >= 0)
				{
					document.getElementById("plano1").href = showplanos[--current_plano];
					document.getElementById("plano2").src = planos[current_plano];
				}
				else
					last_plano();
			}
		}
	
		function first_plano()
		{
			if (num_planos > 0)
			{
				current_plano = 0;
				document.getElementById("plano1").href = showplanos[0];
				document.getElementById("plano2").src = planos[0];
			}
		}
	
		function last_plano()
		{
			current_plano = num_planos - 1;
			document.getElementById("plano1").href = showplanos[current_plano];
			document.getElementById("plano2").src = planos[current_plano];
		}
	
		function ap_plano(text)
		{
			if (num_planos > 0)
			{
			document.getElementById("slidebutton_plano").value = (document.getElementById("slidebutton_plano").value == "Parar") ? "Empezar" : "Parar";
			if (document.getElementById("slidebutton_plano").value == "Empezar")
				document.getElementById("slidebutton_plano").className = "boton stop";
			else
				document.getElementById("slidebutton_plano").className = "boton play";
			
				rotate_plano();
			}
		}
		
		function rotate_plano()
		{
			if (document.getElementById("slidebutton_plano").value == "Empezar")
			{
				current_plano = (current_plano == num_planos - 1) ? 0 : current_plano + 1;
				document.getElementById("plano1").href = showplanos[current_plano];
				document.getElementById("plano2").src = planos[current_plano];
				window.setTimeout("rotate_plano()", rotate_delay);
			}
		}