[OpenLayers-Users] How to refresh the div "map" only?

[geekjack]

Thank you all!
    well after thinking about my question again,your suggestions are all
good.
    If I want to init the map,I can just reload the "init()" function.
    If I want to refresh some dynamic layers in the map,I can use the "
layer.redraw() " (which I nerver use before aha.)

   Somebdy else have the same problem should note that :when you use
yourlayer.redraw() to refresh your layer ,you won't find it refreshed untill
you change it to yourlayer.redraw(tue), I think it may because of the
cache,but I don't sure.mabe you can find the anwser here 
http://trac.openlayers.org/changeset/6171 

   Thank you Imran and Nathan again ! !  suggetions ?
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