jQuery subtract week from date
<p>I have a text box id="somedate" that has a date value "09/27/2009"</p>

<p>I'm looking for an easy way to subtract 7 days and replace the value to 09/20/2009.
then 09/13/2009, etc...at the click of a button</p>

<p>Obviously I need the process to be able to cross back over months and years.</p>

<p>Is there an easy way of doing this in jQuery?</p>
