An ampersand (& – the “and” symbol above the 7 on your keyboard) within an attribute value must use its character entity reference.
For example, the URL below containing the & symbol:
<.a href="http://www.domain.com/cgi-bin/ class.pl?saturday&night&live".>foo<./a>
must be rewritten like this:
<a href="http://www.domain.com/cgi-bin/
class.pl?saturday&night&live">foo</a>
If the ampersand symbol is not used in the URL your web page will not vaildiate for correct XHTML.
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