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) {
		aboutspry_over = newImage("../images/buttons/aboutspry_over.gif");
		aboutspry_mission_over = newImage("../images/buttons/aboutspry_mission_over.gif");
		aboutspry_board_over = newImage("../images/buttons/aboutspry_board_over.gif");
		aboutspry_return_over = newImage("../images/buttons/aboutspry_return_over.gif");
		spryswork_over = newImage("../images/buttons/spryswork_over.gif");
		spryswork_education_over = newImage("../images/buttons/spryswork_education_over.gif");
		spryswork_research_over = newImage("../images/buttons/spryswork_research_over.gif");
		spryswork_policy_over = newImage("../images/buttons/spryswork_policy_over.gif");
		spryswork_return_over = newImage("../images/buttons/spryswork_return_over.gif");
		specialevents_over = newImage("../images/buttons/specialevents_over.gif");
		contactus_over = newImage("../images/buttons/contactus_over.gif");
		search_over = newImage("../images/buttons/search_over.gif");
		home_over = newImage("../images/buttons/home_over.gif");
		archives_over = newImage("../images/buttons/archives_over.gif");
		spryfoundation_return_over = newImage("../images/buttons/spryfoundation_return_over.gif");
		projects_over = newImage("../images/buttons/projects_over.gif")
		publications_over = newImage("../images/buttons/publications_over.gif")
		preloadFlag = true;
	}
}