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I have 3 div\'s like on this image:
div1 has fixed width but variable hei
This should work for you, at least pointing you in the right direction.
CSS:
.box {border:1px dashed black;}
#content {width:1000px;}
#clear {clear:both;}
#left {float:left; width:200px; height:100px; margin-right:15px;}
#top {float:left; width:780px; height:200px;}
#main {float:left; min-width:780px; max-width:1000px;}
HTML:
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