// this array consists of the id attributes of the divs we wish to alternate between
var divs_to_fade = new Array('logo_1', 'logo_2', 'logo_3', 'logo_4');

// the starting index in the above array.  It should be set to the value of the div which doesn't have the CSS Display property set to "none"
var i = 0;

// the number of milliseconds between swaps.  Default is five seconds.
var wait = 5000;


function swap_sponsors() {
	Effect.Fade(divs_to_fade[i], { duration:1, from:1.0, to:0.0 });
	i++;
	if (i == divs_to_fade.length) i = 0;
	Effect.Appear(divs_to_fade[i], { duration:1, from:0.0, to:1.0 });
}

function start_sponsors(){
	setInterval('swap_sponsors()',wait);
}

document.observe("dom:loaded", function() {
  start_sponsors();
});