bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >= 3) ||
(bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3";
else br = "n2";

if (br == "n3") {
img1on = new Image( );
img1on.src  = "images/nav_top_corp_on.gif";
img2on = new Image( );
img2on.src  = "images/nav_top_apt_on.gif";	
img3on = new Image( );
img3on.src  = "images/nav_top_senior_on.gif";	
img4on = new Image( );
img4on.src  = "images/nav_prp_1on.gif";	



img1off = new Image( );
img1off.src  = "images/nav_top_corp_off.gif";
img2off = new Image( );
img2off.src  = "images/nav_top_apt_off.gif";	
img3off = new Image( );
img3off.src  = "images/nav_top_senior_off.gif";	
img4off = new Image( );
img4off.src  = "images/nav_prp_1off.gif";	



}

function imgAct(imgName) {
if (br == "n3") {
document[imgName].src = eval(imgName + "on.src");
}
}

function imgInact(imgName) {
if (br == "n3") {
document[imgName].src = eval(imgName + "off.src");
}
}