function switchimage(b)
{
	var banner = document.getElementById('banner');
	
	banner.src="./style/banners/banner" + b + ".png";
	
	timeoutbanner('4');
}

function timeoutbanner(maxban)
{

	var b = Math.random();
	b = b * maxban;
	b = Math.ceil(b);
	
	setTimeout('switchimage(' + b + ')', 7000);
	
}

timeoutbanner('4');