Modifying Webpage Repeatedly To Add Features?

All semester, I have been working on a single web page, modifying it repeatedly to add features (using CSS). This last assignment involves javascript, something we've just barely touched on. I can't seem to figure out where exactly the event handler should be placed. No matter where I move it, it alters the way the page displays. In the right column, there are descriptions of 2 musicians, each includes a header, paragraph, and a thumbnail (that links to a larger image) on the far right side, next to the text.

I need to add this
<a href="#" onmouseover=
"alert( 'Concerts sell out quickly so act fast!');">Melanie Morris entertains with her melodic folk style.</a>
to this
<h3>January</h3>
<a href="melanie.jpg"><img src="melaniethumb.jpg" alt="Melanie Morris" width="100" height="97" align="right" border="0" hspace="150" /></a>
<p class="content">Melanie Morris entertains<br />
with her melodic folk style.<br />
Check out the podcast!<br />
CDs are now available.
</p>

The problem is, the book doesn't explain where to add it or have any examples of using onmouseover in this particular way, so I've spent forever trying to figure it out. In some places, it makes the sentence shows up twice. In others, it completely moves the picture out of position and/or extends the "Melanie Morris entertains with her melodic folk style" all the way across the page (thus, pushing the picture down). I initially had a very hard time making this page layout work (specifically, getting the images to show up in the right place).

The best I am getting from this is adding the mouseover immediately after the paragraph class and right before the Check out the podcast! line...removing from the paragraph the text that is repeated. It seems to look OK on IE, both full screen and when I make the screen smaller. Foxfire is displaying it less reliably though. As soon as I make the window smaller, the layout shifts. I know that it's normal for different browsers to display differently.

Any way to work around the rules so that it looks right, but is not, in fact, coded properly.
<h3>January</h3>
<a href="melanie.jpg"><img src="melaniethumb.jpg" alt="Melanie Morris" width="100" height="97" align="right"
border="0" hspace="150" /></a>
<p class="content">
<a href="#" onmouseover=
"alert( 'Concerts sell out quickly so act fast!');">Melanie Morris entertains with her melodic folk style.</a>
Check out the podcast!<br />
CDs are now available.
</p>