browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))
ie4 = ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 5 ))
ns4 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 4.5 ))

if (browser){
// main menu images



menu1on = new Image();
menu1on.src = "img/help_on.gif";
menu1off = new Image();
menu1off.src = "img/help_off.gif";

menu2on = new Image();
menu2on.src = "img/how_on.gif";
menu2off = new Image();
menu2off.src = "img/how_off.gif";


goon = new Image();
goon.src = "img/go_on.gif";
gooff = new Image();
gooff.src = "img/go_off.gif";

//
}