2 divs, side by side that takes 100% of the space

[agronii]

I've searched and found many questions and answers here but I just can't get this thing to work.You can view my HTML and CSS here: http://jsfiddle.net/PqjqF/2/HTML\[code\]<div id="SearchBox"> <div id="SearchFieldContainer"> <input class="SearchField" type="text" name="search" placeholder="Search..."/> </div> <div id="SearchButtonContainer"> <a href="http://stackoverflow.com/questions/15667647/#" class="SearchButton">Search</a> </div></div>\[/code\]CSS\[code\]#SearchBox { width: *; background-color: #fff; border-top: 1px solid #ffffff; border-bottom: 1px solid #d2d2d2; height: 40px; padding: 14px 8px 8px 8px; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(92%,#f3f3f3)); background: -webkit-linear-gradient(top, #ffffff 0%,#f3f3f3 92%); /* Chrome10+,Safari5.1+ */ background: linear-gradient(to bottom, #ffffff 0%,#f3f3f3 92%); /* W3C */}#SearchFieldContainer { float: left; width: 100%;}#SearchButtonContainer{ float:left;}.SearchField { border: 1px solid #bdbdbd; background: #f5f5f5; -webkit-border-radius: 60px; border-radius: 60px; color: #0a0705; -webkit-box-shadow: rgba(255,255,255,0.4) 0 1px 0, inset rgba(000,000,000,0.7) 0 1px 1px; box-shadow: rgba(255,255,255,0.4) 0 1px 0, inset rgba(000,000,000,0.7) 0 1px 1px; padding:8px; margin-bottom:20px; width:100%;}.SearchField:focus { background: #fff; color: #000000;}.SearchButton { -webkit-box-shadow: 0px 2px 2px 0px #8a8a8a; box-shadow: 0px 2px 2px 0px #8a8a8a; background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #2f3c47), color-stop(1, #0f1011) ); background-color:#2f3c47; -webkit-border-radius:42px; border-radius:42px; border:1px solid #0d060d; display:inline-block; color:#ffffff; font-family:arial; font-size:18px; font-weight:bold; padding:5px 18px; text-decoration:none;}\[/code\]What I want to have is that the input field will take all the space it has and the search button to be next to it, on the same line.I tried so many things like hidden overflow and other but it refuses to work :-/Any help here?Thanks,- Shai