I just want to share this. I am using sprite images and when I hover it just use the bottom part of the image. This is very handy to speed up your website or blog.
width: 136px; //SIZE OF THE ONE PART OF THE IMAGE
background-position: top; //TOP PART OF IMAGE
display: block; //MAKE THE IMAGE A LINK
background-position: bottom; //BOTTOM PART OF THE IMAGE
<a id='ID' href="http://LINK"> </a>
Nice day for all of you