You can try adding an onClick event handler inside those arbitrary links that will contract all of the header contents for a particular accordion content group when clicked on.
Code:
<div class="arrowsidemenu">
<div><a href="http://www.dynamicdrive.com" title="Home" onClick="jQuery('.menucontents').hide()">Home</a></div>
<div class="menuheaders"><a href="http://www.dynamicdrive.com/style/" title="CSS">CSS Library</a></div>
<ul class="menucontents">
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C1/">Horizontal CSS Menus</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C2/">Vertical CSS Menus</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C4/">Image CSS</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C6/">Form CSS</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C5/">DIVs and containers</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C7/">Links & Buttons</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/category/C8/">Other</a></li>
<li><a href="http://www.dynamicdrive.com/style/csslibrary/all/">Browse All</a></li>
</ul>
<div><a href="http://www.dynamicdrive.com/forums/" title="Forums">Forums</a></div>
<div class="menuheaders"><a href="http://www.javascriptkit.com" title="JavaScript">JavaScript</a></div>
<ul class="menucontents">
<li><a href="http://www.javascriptkit.com/jsref/index.shtml">JavaScript Reference</a></li>
<li><a href="http://www.javascriptkit.com/cutpastejava.shtml">Free JavaScripts</a></li>
</ul>
<div><a href="http://tools.dynamicdrive.com/" title="Tools">Webmaster Tools</a></div>
</div>
where "menucontents" is the shared CSS class of the contents within the accordion group. Clicking on "Home" in this case cases the accordion contents to collapse before navigating to the page in question.
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