For cross browser compatibility you can't assign onMouseOver to a table cell.
If you're using dreamweaver, the easiest way is to insert a rollover image which will create all the code you need. Then go into code view and look at the onMouseover for the <a> tag surrounding the image. MM_swapImage takes 3 parameters, the 1st is the name of the image you want to swap, the 2nd is the file that you want to swap to.
If you're not using Dreamweaver or you need something explained, post again.
Marklar
It's not what you know, it's who knows it that counts.