DIV

 <style>
#a{width:400px;height:200px;border:1px solid red}
#b , #c {text-align:right}
</style>
<div id="a">
<div id="b"><img src="http://bbs.blueidea.com/images/default/logo.gif" /></div>
<div id="c"><img src="http://bbs.blueidea.com/images/default/logo.gif" /></div>
</div>