browser = (((navigator.appName == "Netscape") &&
(parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName ==
"Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

        
        if (browser) {
        toc1on = new Image(107, 25);
        toc1on.src = "images/menu/contatti_ON.gif";
        toc2on = new Image(107, 25);
        toc2on.src = "images/menu/informazioni_ON.gif";
        toc3on = new Image(107, 25);
        toc3on.src = "images/menu/dovesiamo_ON.gif";
		toc4on = new Image(107, 25);
        toc4on.src = "images/menu/news_ON.gif";
		
		
        toc1off = new Image(107, 25);
        toc1off.src = "images/menu/contatti_OFF.gif";
        toc2off = new Image(107, 25);
        toc2off.src = "images/menu/informazioni_OFF.gif";
        toc3off = new Image(107, 25);
        toc3off.src = "images/menu/dovesiamo_OFF.gif";
		toc4off = new Image(107, 25);
        toc4off.src = "images/menu/news_OFF.gif";
				
        }

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

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