Fix always scroll to top issue on IE 7#18

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chrisyip wants to merge 3 commits intotuupola:masterfrom chrisyip:master

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Commits on Jan 17, 2012

1) Fix always scroll to top issue on IE7. 2) Cache window object to
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Support custom source property and able to fallback while using older jQuery.
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Commits on Jan 18, 2012

Fix IE 7 scroll to top issue when window be resized. Change custom
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