Stopping a funtion

I have this function makes a slideshow with divs:

[code]<script language=”JavaScript” type=”text/javascript”>

start_slideshow(1, 4, 10000);

function start_slideshow(start_frame, end_frame, delay) {
a = setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
}

function switch_slides(frame, start_frame, end_frame, delay) {
return (function() {
Effect.Fade(‘slideshow’ + frame);
if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
b = setTimeout(“Effect.Appear(‘slideshow” + frame + “‘);”, 850);
c = setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay + 850);
})
}

}[/code]

I need to be able to click a link to stop the slideshow.

I tried calling this function with a link:

[code]function clearstop() {
window.clearTimeout(a);
window.clearTimeout(b);
window.clearTimeout(c);[/code]

But if the slideshow hasn’t moved to the second div, then b and c are not defined so I get an error.

Please help ?

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