Positioning Images Problem

[viper102464]

Hello all, im brand new to css and know very little. I have been having some problems trying to position images by using the following code:

<STYLE TYPE="text/css">

 <!--
 .img   { position: absolute; left: 32px; top: 80px; z-index: 2 }
 -->

 </STYLE>

Im using dreamweaver and whenever i position something that looks about where i want it in dreamweaver i preview it in firefox and iexplore and both of them have the image at different positions, or sometime doesnt even show the image at all. My site is at http://www.oharanetworks.com/jcr/

All im trying to do is to make all of my corners rounded by using an image. Please help me or let me know better ways of going about this. Thanks. All help is welcomed!

[jscheuer1]

http://www.neuroticweb.com/recursos/....php?idioma=en

and:

http://www.redmelon.net/tstme/4corners/

There are others around, I am sure.