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Low Bandwidth Rollovers:
creating a click effect for IE with a third image

If you are using Explorer 4, click on the image map below.

This pinch effect is, of course, created by clipping a third overlayed image whenever the mousedown and mouseup events fire over an AREA.

First, prepare a third image with the pinch effect:

Add the CSS element:

    #elMenuDown {
        position: absolute;
        visibility: hidden;
        top: 0;
        left: 0
    }

Add a new string variable for the third image you've created:

if (IE4) {
    thirdIm = "<IMG SRC='menudown.gif' USEMAP='#mpMenu' WIDTH=468 HEIGHT=18 BORDER=0>";
}
else { thirdIm = "" }

Add the function:

function mapDown(which,on) {
    if (!IE4) { return }
    whichEl = document.all.elMenuDown.style;
    if (!on) { whichEl.visibility = "hidden"; return }

    clLeft = arPopups[which][0];
    clRight = arPopups[which][1];
    whichEl.clip = "rect(" + clTop + " " + clRight + " " + clBot + " " + clLeft + ")";

    whichEl.visibility = "visible" 
}

Insert your new image as a CSS element, nested in elMenu and after elMenuOver, dynamically with JavaScript:

<DIV ID="elMenuDown">
    <SCRIPT LANGUAGE="JavaScript">document.write(thirdIm)</SCRIPT>
</DIV>

And finally, modify the MAP's 7 links to include the two events:

onMouseDown="mapDown(linkNumber,true)" onMouseUp="mapDown(linkNumber,false)"

Rollover with 1 (one) Image

Produced by Peter Belesis and

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Created: 08/06/97
Revised: 10/16/97

URL: http://www.webreference.com/dhtml/column2/IEdown.html