Zoom with middle button does not work well with FireFox + Ajax View.

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Zoom with middle button does not work well with FireFox + Ajax View. It should work well as IE

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It seems that only IE works fine when Zoom with middle button. Chrome and Safari also has this kind of problem.

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In ajaxmappane.templ line 3685,

wheelZoomCursor = new Point(msie ? event.clientX - mapPosX : event.screenX - mapPosX,
        		msie ? event.clientY : event.screenY);

event.clientX returns the horizontal coordinate within the application's client area at which the event occurred
event.screenX returns the horizontal coordinate of the event within the screen as a whole.
So, other browsers besides IE should also use event.clientX - mapPosX and event.clientY to indicate the cursor's position on map.

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Fixed at ​https://trac.osgeo.org/mapguide/changeset/4525