browserName=navigator.appName;
browserVer=parseInt(navigator.appVersion);
        if ((browserName == "Netscape" && browserVer >= 3) ||
	(browserName == "Microsoft Internet Explorer" && browserVer >= 4)) version="n3";
	
        else version="n2";
        
        if (version == "n3")         {
    
        nav1on=new Image(101, 22);
        nav1on.src="/developer/graphics/tab_hdr_home_on.jpg";
        nav1off=new Image(101, 22);
        nav1off.src="/developer/graphics/tab_hdr_home_off.jpg";

        nav2on=new Image(96, 22);
        nav2on.src="/developer/graphics/tab_hdr_app_gallery_on.jpg";
        nav2off=new Image(96, 22);
        nav2off.src="/developer/graphics/tab_hdr_app_gallery_off.jpg";

        nav3on=new Image(95, 22);
        nav3on.src="/developer/graphics/tab_hdr_docs_on.jpg";
        nav3off=new Image(95, 22);
        nav3off.src="/developer/graphics/tab_hdr_docs_off.jpg";

        nav4on=new Image(95, 22);
        nav4on.src="/developer/graphics/tab_hdr_blog_on.jpg";
        nav4off=new Image(95, 22);
        nav4off.src="/developer/graphics/tab_hdr_blog_off.jpg";

        nav5on=new Image(95, 22);
        nav5on.src="/developer/graphics/tab_hdr_forum_on.jpg";
        nav5off=new Image(95, 22);
        nav5off.src="/developer/graphics/tab_hdr_forum_off.jpg";

        nav6on=new Image(95, 22);
        nav6on.src="/developer/graphics/tab_hdr_feedback_on.jpg";
        nav6off=new Image(95, 22);
        nav6off.src="/developer/graphics/tab_hdr_feedback_off.jpg";

        }

function img_act(imgName) {
        if (version == "n3") {
        imgOn=eval(imgName + "on.src");
        document [imgName].src=imgOn;
        }
}

function img_inact(imgName) {
        if (version == "n3") {
        imgOff=eval(imgName + "off.src");
        document [imgName].src=imgOff;
        }
}