insert/ edit link explained

Hello.

I’m making a site where I’d like to have a link that displays my image when you roll over it. Looking at the link options, I thought maybe enabling the java popup would work. I noticed it generated a path or something when I did this in the EVENT tab next to onclick. I also noticed there was an onmouseover option on the EVENTS tab.

Here’s my question. Is there any source that explains all of these link tabs and options in detail and what you should put in.

For example…what would I put next to onmouseover in the EVENTS tab to make it popup on mouse over?

Is what I’m trying to do even possible with the link feature in wordpress?

So far I’ve gotten the image to pop up when you CLICK the link, but I’d like a rollover popup better. Please help.