How to make a 3 column layout fill 100% width?

[JOGL]

jsFiddle: http://jsfiddle.net/mYkjQ/How do I make div2 + Button2 fill the rest of the window width?Thank you.CSS\[code\]td { border:solid 1px #000; float:left; }#div1 { width:30%; border:solid 1px #000; float:left; }#div2 { border:solid 1px #000; float:left; }#div3 { width:30%; border:solid 1px #000; float:right; }#Button1 { width:100% }#Button2 { width:100% }#Button3 { width:100% }\[/code\]HTML\[code\]<div id="div1"> <button id="Button1">Button 1</button></div><div id="div2"> <button id="Button2">Button 2</button></div><div id="div3"> <button id="Button3">Button 3</button></div>\[/code\]