html - One static height div and 2 flexible height divs inside container -


i'm creating small chat site.

<div id="container">     <div id="user"></div>     <div id="chat"></div>     <div id="chatform"></div> </div> 

what end result should this: http://jsfiddle.net/xxhtc/2/

this pretty easy when know height of user div. however, user div not have known height, expands , shrinks users log on , off.

the chatform @ bottom has known height, can set position absolute , bottom: "height of chatform div" it's height chat not overlap it.

how can set "top" value of chat relative user div expands/shrinks. don't want user div hide in chat div.

you'll need use javascript determine height of div#user , set top position of div#chat equal height.

demo


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