Problem with validation

Hey all,

I'm running into some errors when I'm validating my HTML. The problem is a link I have in the nav bar.

Here's the part of the link that is trouble.

Donate.aspx?P=PBSARTS&PAGETYPE=PLG&CHECK=vPLRrnZ9yuVnWGoLWQeIa…


The validation says there are several issues with this link and won't pass validation.

Is this something to worry about? I can't change the link url. Is there a way to still pass validation?

Change all the & to &