function imageSwap(i_zImgName, i_zImgNewSrc){
	if (document.images){
		document.images[i_zImgName].src = i_zImgNewSrc;
	}
}


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) {
		nav01_over = newImage("images/nav01a.gif");
		nav02_over = newImage("images/nav02a.gif");
		nav03_over = newImage("images/nav03a.gif");
		nav06_over = newImage("images/nav04a.gif");
		nav05_over = newImage("images/nav05a.gif");
		preloadFlag = true;
	}
}