var version
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer < 4) 
	version = "n3";
else if (browserName == "Netscape" && browserVer >= 4)
	version = "n4";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4)
	version = "e4";
else 
	version = "e3";

if (version != "e3")
{
        button1_on = new Image;
        button1_on.src = "http://luar.net/sf/images/button1b.gif";
        button1_off = new Image;
        button1_off.src = "http://luar.net/sf/images/button1a.gif";
        button2_on = new Image;
        button2_on.src = "http://luar.net/sf/images/button2b.gif";
        button2_off = new Image;
        button2_off.src = "http://luar.net/sf/images/button2a.gif";
        button3_on = new Image;
        button3_on.src = "http://luar.net/sf/images/button3b.gif";
        button3_off = new Image;
        button3_off.src = "http://luar.net/sf/images/button3a.gif";
        button4_on = new Image;
        button4_on.src = "http://luar.net/sf/images/button4b.gif";
        button4_off = new Image;
        button4_off.src = "http://luar.net/sf/images/button4a.gif";
        button5_on = new Image;
        button5_on.src = "http://luar.net/sf/images/button5b.gif";
        button5_off = new Image;
        button5_off.src = "http://luar.net/sf/images/button5a.gif";
        button6_on = new Image;
        button6_on.src = "http://luar.net/sf/images/button6b.gif";
        button6_off = new Image;
        button6_off.src = "http://luar.net/sf/images/button6a.gif";
        button7_on = new Image;
        button7_on.src = "http://luar.net/sf/images/button7b.gif";
        button7_off = new Image;
        button7_off.src = "http://luar.net/sf/images/button7a.gif";
}

function img_act(imgName) {
        if (version != "e3"){
                document[imgName].src = eval(imgName + "_on.src");
	}
}

function img_inact(imgName) {
        if (version != "e3"){
                document[imgName].src = eval(imgName + "_off.src");
	}
}