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(95, 22);
        nav1on.src="/graphics/tab_hdr_hosted_pbx_on.jpg";
        nav1off=new Image(95, 22);
        nav1off.src="/graphics/tab_hdr_hosted_pbx_off.jpg";

        nav2on=new Image(90, 22);
        nav2on.src="/graphics/tab_hdr_sip_trunking_on.jpg";
        nav2off=new Image(90, 22);
        nav2off.src="/graphics/tab_hdr_sip_trunking_off.jpg";

        nav3on=new Image(89, 22);
        nav3on.src="/graphics/tab_hdr_aboutus_on.jpg";
        nav3off=new Image(89, 22);
        nav3off.src="/graphics/tab_hdr_aboutus_off.jpg";

        nav4on=new Image(89, 22);
        nav4on.src="/graphics/tab_hdr_partners_on.jpg";
        nav4off=new Image(89, 22);
        nav4off.src="/graphics/tab_hdr_partners_off.jpg";

        nav5on=new Image(89, 22);
        nav5on.src="/graphics/tab_hdr_testimonials_on.jpg";
        nav5off=new Image(89, 22);
        nav5off.src="/graphics/tab_hdr_testimonials_off.jpg";

        nav6on=new Image(89, 22);
        nav6on.src="/graphics/tab_hdr_support_on.jpg";
        nav6off=new Image(89, 22);
        nav6off.src="/graphics/tab_hdr_support_off.jpg";

        nav7on=new Image(89, 22);
        nav7on.src="/graphics/tab_hdr_contactus_on.jpg";
        nav7off=new Image(989, 22);
        nav7off.src="/graphics/tab_hdr_contactus_off.jpg";

        nav8on=new Image(124, 22);
        nav8on.src="/graphics/tab_hdr_portallogin_on.jpg";
        nav8off=new Image(124, 22);
        nav8off.src="/graphics/tab_hdr_portallogin_off.jpg";

        nav9on=new Image(106, 22);
        nav9on.src="/graphics/tab_hdr_hosted_exchange_on.jpg";
        nav9off=new Image(106, 22);
        nav9off.src="/graphics/tab_hdr_hosted_exchange_off.jpg";

        nav10on=new Image(54, 22);
        nav10on.src="/graphics/tab_hdr_blog_on.jpg";
        nav10off=new Image(54, 22);
        nav10off.src="/graphics/tab_hdr_blog_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;
        }
}