var c = 1;

var milliseconds = 12000;
var maximages = 3;

function disp_img(w)
	{
	if (c > maximages )
		{	
		c = 1;
		}
	
	if (c == 1)
		{
         document.getElementById("Panel1").style.visibility="hidden";
         document.getElementById("Panel3").style.visibility="hidden";
         document.getElementById("Panel2").style.visibility="visible";
		}

	if (c == 2)
		{
         document.getElementById("Panel1").style.visibility="hidden";
         document.getElementById("Panel2").style.visibility="hidden";
         document.getElementById("Panel3").style.visibility="visible";
		}
	
	if (c == 3)
		{
         document.getElementById("Panel2").style.visibility="hidden";
         document.getElementById("Panel3").style.visibility="hidden";
         document.getElementById("Panel1").style.visibility="visible";
 		}

	c++;
	}

t = setInterval("disp_img(c)", milliseconds);