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

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

function preloadImages() {
	if (document.images) {
		nav_01h = newImage("i/nav_01h.gif");
		nav_02h = newImage("i/nav_02h.gif");
		nav_03h = newImage("i/nav_03h.gif");
		tools_01h = newImage("i/tools_01h.gif");
		tools_02h = newImage("i/tools_02h.gif");
		tools_03h = newImage("i/tools_03h.gif");
		tools_04h = newImage("i/tools_04h.gif");				
		tools_05h = newImage("i/tools_05h.gif");
		tools_06h = newImage("i/tools_06h.gif");
		tools_07h = newImage("i/tools_07h.gif");
		tools_08h = newImage("i/tools_08h.gif");
	}
}