replace table by one code tag

Hi,

I want to replace all HTML <table> with attribute bgcolor="blue" by
<code></code> tags. But if the table contains <code>, I want the result to have
only one <code>

ie :
<table bgcolor="blue"><tr><td><code>a<code>b</code></code>c</...>
or
<table bgcolor="blue"><tr><td>abc</...>
must return
<code>abc</code>

Any suggestion?

regards,
Steve