CCS - img elements adjacent upon window resize

Hello!

I have something like this:

<style type="text/css">

     .imgbox {

          clear:both;

          width:100%;

     }

     img {

          float:left;

     }

</style>

<div id="imgbox">

     <img src="" />

     <img src="" />

</div>

I need the images to stay adjacent even upon resize. Currently the right image falls below the second when the space gets too small.

How is this done?

Thx,

Donovan