CSS problem (Opera)

Can anyone help with this. I always mainly use Firefox and alittle IE when making the design. I never really had many problems in opera. And sadly i can't use any hacks at work for it. im having trouble setting th min-width of a div and could have sworn this used to wrok but not any more apperently.

here's the problem recreated(way to much to post the real problem)

html>
head>
style>
* [ margin: 0; padding: 0; height: 20em;]
div#wrapper [
min-width: 939;
]
div#left [
width: 20em;
float:left;
border: solid 2px red;
]
div#right [
width: 20em;
float: right;
border: solid 2px green;
]
div#center [
border: solid 2px blue;
]
/style>
/head>
body>
div id='wrapper'>
div id='left'>
div id='right'>
div id='center'>
/div>
/body>
/html>


it works in firefox but not in opera.
the left and right divs are fixed width and the center one takes up the rest of the space

This is making me crazy! any help would be apreciated

(edit)i hope thats understand able, didn't think about it messing up the tags
edit entities undid
(all i do here is css )
[edit on 21-8-2007 by ThaDewd]

[edit on 21-8-2007 by ThaDewd]

[edit on 21-8-2007 by ThaDewd]

well i found the best fix i could.....
i upgraded...