// test the browser for ie or nets version 3 or greater
if ((navigator.appVersion.substring(0,1) >= 3) && 
	(navigator.appName == ("Netscape") || 
	(navigator.appName == "Microsoft Internet Explorer"))) {
	// build the array for on images (when mouseover) and off
	    offNav = new Array();
	    onNav = new Array();
	    selNav = new Array();
	    for (var n = 0; n<= 4; n++) {
	        offNav[n] = new Image();
	        offNav[n].src = "images/nav/n" + n + "d.gif";
	        onNav[n] = new Image();
	        onNav[n].src = "images/nav/n" + n + "s.gif";
	        selNav[n] = new Image();
	        selNav[n].src = "images/nav/n" + n + "on.gif";
	    }
}

function navOver(navNum) {
    var itemname = "n" + navNum;
    document.images[itemname].src = onNav[navNum].src;
}

function navOut(navNum) {
    var itemname = "n" + navNum;
	if (mainNav == navNum) {
	    document.images[itemname].src = selNav[mainNav].src;
	}
	else {
	    document.images[itemname].src = offNav[navNum].src;
	}
}