"Browser Detection" Version 3

document.images is only implemented in JavaScript 1.1 and later. This eliminates a whole class of older browsers in one swoop.

<SCRIPT>

if (document.images) {
     var displayOn = new Image;
     displayOn.src = 'images/displayOn.gif';

     var displayOff = new Image;
     displayOff.src = 'images/displayOff.gif';
}

</SCRIPT>

Actual Code at Work