window.onerror=null;
var netscape = 0;
var goodIE = 0;

browserName = navigator.appName.substring(0,8);
browserVer = parseFloat(navigator.appVersion);

if (browserName == "Netscape" && browserVer >= 3)
{ netscape = 1; }
if (browserName == "Microsof" && browserVer >= 3.01)
{ goodIE = 1; }

if ( netscape || goodIE )
{

x1_on = new Image(); x1_on.src = "images/1off.jpg";
x1_off = new Image(); x1_off.src = "images/1on.jpg";
x2_on = new Image(); x2_on.src = "images/2off.jpg";
x2_off = new Image(); x2_off.src = "images/2on.jpg";
x3_on = new Image(); x3_on.src = "images/3off.jpg";
x3_off = new Image(); x3_off.src = "images/3on.jpg";

}

function img_act(imgName)
{
if (netscape || goodIE)
{
document[imgName].src = eval(imgName + "_on.src");
}
}

function img_inact(imgName)
{
if (netscape || goodIE)
{
document[imgName].src = eval(imgName + "_off.src");
}
}

//-->

</script>

Aktivering av scriptet:

<A HREF="1.htm" onMouseover="img_act('x1')"; onMouseout="img_inact('x1')"><IMG SRC="images/1on.jpg" NAME="x1"></A><BR>
<A HREF="2.htm" onMouseover="img_act('x2')"; onMouseout="img_inact('x2')"><IMG SRC="images/2on.jpg" NAME="x2"></A><BR>
<A HREF="3.htm" onMouseover="img_act('x3')"; onMouseout="img_inact('x3')"><IMG SRC="images/3on.jpg" NAME="x3"></A><BR>