How to do & in a <media href="...?

Hello.

I am trying to insert an paypal-donate link in my 
help-dialog(projectmallard <mailto:mallard-list at projectmallard.org>)
The link look like this:
<p>
       <media
href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=terkelsorensen%40gmail%2ecom&lc=US&no_note=0&currency_code=DKK&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHostedGuest" 

             type="image" mime="image/png"
             src="figures/paypal.png"/>
</p>

The problem is '&' in the href-tag..
If I use '&' then the help-dialog response with:
Page Not Found

The page 'donate' was not found in the document 
'ghelp:/path/to/my/app/help/C'.


So is there an way fix this?



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