CSS float:left always inserts line break

[notepadman]

I have two columns of data [namely a navigation list and content block]. They are enclosed in a global div that defines the background colour, width, border, all that good stuff. Each column also has its own div block which contains a bit more formatting [namely float:left on both of them, and a few more things]. I had wanted both items to show on the same line [without using tables, if possible], but in FF/Opera, it adds a line break at the start of the second column. I've attached some screenshots of them in respective browsers:
IE:
FF:

Suggestions ?

[drhowarddrfine]

Without a link, or the complete markup, it's impossible to help.

[shane3341436]

I have two columns of data [namely a navigation list and content block]. They are enclosed in a global div that defines the background colour, width, border, all that good stuff. Each column also has its own div block which contains a bit more formatting [namely float:left on both of them, and a few more things]. I had wanted both items to show on the same line [without using tables, if possible], but in FF/Opera, it adds a line break at the start of the second column. I've attached some screenshots of them in respective browsers:
IE:
FF:

Suggestions ?

Please make sure that each item is enclosed in the div tag
and of course without complete markup no one can help.