var bannerImage = new Array();
bannerImage[0] = "logos/logocsme2.jpg";
bannerImage[1] = "logos/logopmi2.jpg";
bannerImage[2] = "logos/logoaskedu2.jpg";

// Determine number of banners
var bannerCount = bannerImage.length;
// starting banner will be random
var nextBanner = Math.floor(Math.random()*bannerCount);

// Preload images
var preloadimage = new Array();
for(i = 0; i < bannerCount; i++){
	preloadimage[i] = new Image();
	preloadimage[i].src = bannerImage[i];
}

// Generate HTML code for each banner
var bannerHtml = new Array();
for(i = 0; i < bannerCount; i++){
	bannerHtml[i] = "<img src='" + bannerImage[i] + "'>";
}

// Generate link for each banner
var bannerLink = new Array();
bannerLink[0] = "http://www.csme.us/process.html"
bannerLink[1] = "http://sparky.occe.ou.edu/pmi/php/profilebox2.php?pass=2626&id=1"
bannerLink[2] = "http://www.askedu.net/"

window.onload = Start_banner;

function Start_banner() {
	Display_banner();
	bannerInterval = setInterval(Display_banner, 3000);  
}

function Display_banner() {
	nextBanner++;
	if (nextBanner>bannerCount-1)
	   nextBanner=0;	
	var banner = document.getElementById("banner_link");
	banner.innerHTML = bannerHtml[nextBanner];
	banner.href = bannerLink[nextBanner];
}