[css-d] Height collapses in Firefox 1.5

[css man]

I have a  #container div:

#container {
               border: .4em solid #cc6;
               background-color: #fff;
               height: 42.1em; <--must be set specific value, otherwise
collapes-->
               font-size: .95em;
               margin: 0 auto;
               padding: 0;
               position: relative;
               text-align: left;
               width: 775px;
                              voice-family: "\"}\"";
               voice-family: inherit;
               width: 775px;
}

Unless I set the height to a specific value, height collapses; works fine in
IE6.

Can someome explain what I'm doing wrong here?
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