how multiple <img /> caculate its width

for example:

<div class="touchslider-item" style="position: absolute; left: -10000px;">
<img onclick="javascript:DoFace('@3010');" src="face/3012.gif" width="20px" height="20px"><img onclick="javascript:DoFace('@3012');" src="face/3010.gif" width="20px" height="20px">
</div>

if my content like this,how can i fix to get correct width?thx
