[OpenLayers-Trac] [OpenLayers] #650: Default image foramt to not-jpg for transparent images

[OpenLayers]

#650: Default image foramt to not-jpg for transparent images
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  Reporter:  crschmidt  |       Owner:             
      Type:  feature    |      Status:  new        
  Priority:  minor      |   Milestone:  2.5 Release
 Component:  Layer.WMS  |     Version:             
Resolution:             |    Keywords:  review     
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Changes (by crschmidt):

  * keywords:  => review

Comment:

 If a layer is marked transparent, we should try to help the user out by
 making it transparent for them. This patch adds logic in initialize that
 changes image/jpeg to either image/png, or, if in IE, image/gif.

 Includes tests.

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Ticket URL: <http://trac.openlayers.org/ticket/650#comment:1>
OpenLayers <http://openlayers.org/>
A free AJAX map viewer