FF hangs and divs

Hi all!

I'm using FckEditor and I found osme problems: first of all, I use CSS and FCKeditor in order to add pages to my website. The edited text oftean is enclosed into <div> tags. Sometimes there are also stupid <span style="color: black;"> tags or unuseful <p> </p>. Since I'm using css, the main problem are divs tags, which spoil all my css work. Is there the possibility to remove them? Also, can I remove the color style?
In the title I also added hang because I tried using the normal font format in order to remove the div style, but if I do it firefox hangs.
The source code where it hangs is:

<p> </p>
<div style="text-align: justify;">text....</div>
</span></p>
<div style="text-align: justify;"> </div>
<p><span style="font-size: small;">
<div style="text-align: justify;"><b> </b></div>
</span></p>
<div style="text-align: justify;"> </div>
<p><span style="font-size: small;">
<div style="text-align: justify;"><b> </b></div>
</span></p>
<div style="text-align: justify;"><span style="font-size: small;"><b><i>text</i>-</b> text <b><i>text </i></b> text <b><i>text</i></b>. text,,,,</span></span></div>

i select all and use normal and it hangs.

Thanks everyone for the help