var urls = new Array('images/header_bg_1.png','images/header_bg_2.png','images/header_bg_3.png');

	function getRandomImage()
	{
		if (document.images)
		{
			var imgs = new Array(urls.length);
			for(var i=0; i<imgs.length; i++)
			{
				var img = new Image();
				img.src = urls[i];
				imgs[i] = img;
			}

			var rn = Math.floor(Math.random()*urls.length);

			document.getElementById('mid').innerHTML="<img src='" + imgs[rn].src + "' >";
		}
	}

var t;
function rdnImage()
{
getRandomImage()
t=setTimeout("rdnImage()",3000);

}

function swapBackground(){
document.getElementById('wrapper').style.visibility="visible";
document.getElementById('wrapper1').style.display="none";

}
function loadFrame(time)
{
var t=setTimeout("swapBackground()",time);
}