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

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

preldFlag = false;
function preloadLocalImages() {
	if (document.images) {
		btn_prog_down = nwImage("conference/GRCs/news/btn_prog-down.gif");
		btn_proceed_down = nwImage("conference/GRCs/news/btn_proceed-down.gif");
		btn_portfolio_down = nwImage("conference/GRCs/news/btn_portfolio-down.gif");
		btn_participants_down = nwImage("conference/GRCs/news/btn_participants-down.gif");
		btn_agenda_down = nwImage("grcs/en/btns/btn_prog-down.gif");
		preldFlag = true;
	}
}