How to use div+css make three columns in html.
left and right columns width:auto, and middle one need width:990px(should be in the center) and they are height:100%.
HTML
<div style=" float:left; width:auto; height: 100%;background-color:#006;">Area1</div>
<div style=" float:left; width:990px; height: 100%;">Area2</div>
<div style=" float:left; width:auto; height: 100%;background-color:#006633;">Area3</div>