//---------------------------------------------------------------------
// menu ---------------------------------------------------------------
//---------------------------------------------------------------------

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") {
        c1on = new Image(109, 25); c1on.src = "./gfx/but01b.gif";
        c2on = new Image(109, 25); c2on.src = "./gfx/but02b.gif";
	     c3on = new Image(109, 25); c3on.src = "./gfx/but03b.gif";
        c4on = new Image(109, 25); c4on.src = "./gfx/but04b.gif";
        	       
 
        c1off = new Image(109, 25); c1off.src = "./gfx/but01.gif";
        c2off = new Image(109, 25); c2off.src = "./gfx/but02.gif";
        c3off = new Image(109, 25); c3off.src = "./gfx/but03.gif";
        c4off = new Image(109, 25); c4off.src = "./gfx/but04.gif";
        }
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;
        }
}