Is there a way to have more than one border for your entries on livejournal
and is there a way to put different borders around your navigation box?

nesting the tables or divs or whatever you use can lead to the results you are looking for.

<div style="border: dotted 3px blue;">
<div style="border: solid 4px red;">
text here
</div>
</div>

same thing with tables:

<table><tr><td>
<table><tr><td>
text here
</td></tr></table>
</td></tr></table>

if you add to both <table> tags the different borders then you'll have two borders :)

Love,
Mirna