Cannot italicize and bold paragraphs that contain links

Hi,
If I select text that contains links and click I or B (italics, bold), the resulting HTML cannot italicize the entire paragraph, and inserts italics inside links:

Before:

<p>
Posted to <a _fcksavedurl="..." href="...">My Site</a>  
by <a _fcksavedurl="..." href="...">User</a>.
</p>

After

<p>
<em>Posted to </em>
<a _fcksavedurl="..." href="..."><em> My Site </em></a>
<em> by </em><a _fcksavedurl="..." href="..."><em> User </em></a><em>.</em>
</p>

I did some HTML formatting to make it readable, the original is one long line.

Is it possible to have just one <em> in the paragraph, instead of closing and opening around links?
Is this some DTD restriction that can be solved using a different document type/DTD?
Is it browser behavior of FCK behavior?

Thanks