If by "jumping around" you mean how the page scrolls up when you click one of the links for magnified local radar, it's due to a 'feature' I'd added in quite a while ago. The URL in the browser has a '#WUtop' appended to it, so the browser will scroll to where it finds the <a name="WUtop" id="WUtop"></a> link, which happens to be placed just before the top of the display of the map. It was intended to keep the map visible (at the top of the browser) when folks clicked on different maps.
If you find it more annoying than helpful, a change of WU-radar-inc.php from
<a name="WUtop" id="WUtop"></a>
<!-- a name="WUtop" id="WUtop"></a -->
will stop the jumping around.
Yes, that is exactly what I am seeing. It wouldn't be so bad if it remained at the same vertical position with each zoom level but it doesn't and moves up and down depending on which zoom level you select as well as being dependent on which browser one is using.
I'll try the change and see what happens.
Thanks for the quick reply (as always)...