function openWindow(theURL,winName,features) { 
  window.open(theURL,winName,features);
}

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) {
       bt_home_over = newImage("images/bt_home_over.gif");
       bt_program_over = newImage("images/bt_program_over.gif");
       bt_ourSponsors_over = newImage("images/bt_ourSponsors_over.gif");
       bt_sites_over = newImage("images/bt_sites_over.gif");
       bt_comm_over = newImage("images/bt_comm_over.gif");
       bt_specs_over = newImage("images/bt_specs_over.gif");
       bt_contact_over = newImage("images/bt_contact_over.gif");
  preloadFlag = true;
  }
}