NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion);

var allpicsrc = new Array();
var timeout;

if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; }
else { roll = 'false'; }

function on(img) { if (roll == 'true' && img != '') { document.images[img].src = 'images/' + img + '-a.gif'; } }
function off(img) { if (roll == 'true' && img != '') { document.images[img].src = 'images/' + img + '-p.gif'; } }

//Preload images

if (roll == 'true')
{

 iabout=new Image();
 iabout.src='images/iabout-a.gif';

 ivacations=new Image();
 ivacations.src='images/ivacations-a.gif';

 icatalogue=new Image();
 icatalogue.src='images/icatalogue-a.gif';

 inews=new Image();
 inews.src='images/inews-a.gif';

 iprom=new Image();
 iprom.src='images/iprom-a.gif';

}