Use fade transitions for IE

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http://msdn.microsoft.com/en-us/library/ms532990#
http://www.javascriptkit.com/howto/showie4.shtml
http://www.javascriptkit.com/filters/fadetransition.shtml

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this was not addressed with fade transitions as the MSIE transition filter API requires content to change in addition to taking snapshots of the state of an element. went to use the JS api for opacity filter instead, but lowered interval to be more performant - committed 07f785f