FCKEditor not shown in scond column in Firefox

I am using a two column layout in my CMS. This is made with the help of CSS. The first column holds the navigation and the second column holds the FCKEditor and some other sall stuff.

In IE this this shown as expected. In Firefox I can see the two columns but the FCKEditor itself is shown below the two columns and ignors the columns. (It is shown on 100% of the browser with.

MyCss:
#navigation
{
position: relative;
width: 200px;
height: 570px;
font-size: 16px;
clear:left; float:left;
}

#content
{
text-align:left;
min-height:570px;
}

Is there anyone how can help me solve this problem? Any help is greatly apprechiated!
Thank you!