function randomImage(max) {
    var rNum=NaN
    while (isNaN(rNum)) {
      rNum=Math.floor(Math.random()*(max))
    }
    return rNum
  }
  
  var pic = new Array()
  pic[0]="../img/core/header01.jpg";
  pic[1]="../img/core/header02.jpg";
  pic[2]="../img/core/header03.jpg";
  pic[3]="../img/core/header04.jpg";
  pic[4]="../img/core/header05.jpg";
  pic[5]="../img/core/header06.jpg";
  
  theImage='<img src="'
  theImage+=pic[randomImage(pic.length)]
  theImage+='" width="780" height="150" alt="" />'

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		home_over = newImage("../img/core/home_over.gif");
		aboutus_over = newImage("../img/core/aboutus_over.gif");
		getinvolved_over = newImage("../img/core/getinvolved_over.gif");
		oursponsors_over = newImage("../img/core/oursponsors_over.gif");
		events_over = newImage("../img/core/events_over.gif");
		tourinfo_over = newImage("../img/core/tourinfo_over.gif");
		resources_over = newImage("../img/core/resources_over.gif");
		giftcatalogue_over = newImage("../img/core/giftcatalogue_over.gif");
		sitemap_over = newImage("../img/core/sitemap_over.gif");
		contactus_over = newImage("../img/core/contactus_over.gif");
		donatenow_over = newImage("../img/core/donatenow_over.gif");
		preloadFlag = true;
	}
}