var      compat = "false"
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) compat = "true";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) compat = "true";

var     nRollOverFlag = 0;
var     nTotalImages = 0;

if (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 ))
|| ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ))) 
	{
	nRollOverFlag = 1;
	var ImageName = new Array();
	var ImageArray = new Array();
	}

function AddImageCache(sImageName, sImageURL) {
        if (!nRollOverFlag) return(-2);
        ImageName[nTotalImages] = sImageName;
        ImageArray[nTotalImages] = new Image();
        ImageArray[nTotalImages].src = sImageURL;
        nTotalImages += 1;
        return(0);
    }
	
function FindImage(sImageName) {
   if (!nRollOverFlag) return(-2);
        var nTemp = 0;
        var nFound = -1;
        while (nTemp < nTotalImages) {
                if (ImageName[nTemp] == sImageName) {
                        nFound = nTemp;
                        break;                          
                        }
                nTemp += 1;
                }
        return(nFound);
        }
		
function swapimage(xobject, sImageName) {
        if (!nRollOverFlag) return(-2);
        var nImageIndex = -1;
        nImageIndex = FindImage(sImageName);
        if (nImageIndex >= 0) {
                document.images[xobject].src = ImageArray[nImageIndex].src;
                }
        return(0);
        }
		
if (nRollOverFlag) {

   AddImageCache("overview_off", "images/overview_off.gif");
   AddImageCache("overview_on", "images/overview_on.gif");
   AddImageCache("adv_off", "images/adv_off.gif");
   AddImageCache("adv_on", "images/adv_on.gif");
   AddImageCache("agenda_off", "images/agenda_off.gif");
   AddImageCache("agenda_on", "images/agenda_on.gif");
   AddImageCache("spons_off", "images/spons_off.gif");
   AddImageCache("spons_on", "images/spons_on.gif");
   AddImageCache("contacts_off", "images/contacts_off.gif");
   AddImageCache("contacts_on", "images/contacts_on.gif");
   AddImageCache("hotel_off", "images/hotel_off.gif");
   AddImageCache("hotel_on", "images/hotel_on.gif");
    AddImageCache("speakers_off", "images/speakers_off.gif");
   AddImageCache("speakers_on", "images/speakers_on.gif");
}