Editing a Library Template

This questions applies only to SharePoint Foundation 2010

I would like to insert code into a library template. If I can't, I'll have to edit each library.

The code I want to insert is:

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&nbsp;<a href="javascript:history.go(-1);"><img alt="Go Back" longdesc="Go Back One Level" src="../../SiteAssets  /GoBack.gif" border="0" width="18" height="22" /></a><br />
&nbsp;Carlsbad/Artesia - WIA Adult Dislocated Worker

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Thanks.