var preloaded = false;
preload();
if(document.all && !document.getElementById) { 
	document.getElementById = function(id) { return document.all[id]; }
}

function newimg(x) {
	if (document.images) {
		i = new Image();
		i.src = x;
		return i;
	}
}
function navswap(nav,ver) {
	if (preloaded == true) {
		document.getElementById('nav-'+nav).src = './images/nav/'+nav+ver+'.gif';
	}
}

function preload() {
	if (document.images) {
		homeh = newimg("./images/nav/homeh.gif");
		aboutush = newimg("./images/nav/aboutush.gif");
		ourworkh = newimg("./images/nav/ourworkh.gif");
		contactush = newimg("./images/nav/contactush.gif");
		preloaded = true;
	}
}