Using CSS to float forms and images

I currently have a dropdown box that when the user selects one of the eight images, it displays on the webpage. However, just now the image goes directly above the dropbox and I would like it so the image is displayed on the left and the dropbox on the right. I am just not sure how to code the css as the two are connected so I don’t know if div classes would work.

Here’s the code:

<img id="imageToSwap" src="kittens1.jpg"/>

<select id="kittenlist" onChange="swapImage()">
<option value="kittens1.jpg">Image 1</option>
<option value="kittens2.jpg">Image 2</option>
<option value="kittens3.jpg">Image 3</option>
<option value="kittens4.jpg">Image 4</option>
<option value="kittens5.jpg">Image 5</option>
<option value="kittens6.jpg">Image 6</option>
<option value="kittens7.jpg">Image 7</option>
<option value="kittens8.jpg">Image 8</option>
</select>