Velocity Reviews - [JAVASCRIPT, PHP, MYSQL] Pass Variable from a non-trigger frame to another.

Hello, I am hoping that someone can point me in the right direction.
I have 4 frames to my site. Two Rows, Two Columns.
|--------------------------------|-------------------------|
| | |
| 1 | 2 |
| | |
|--------------------------------|-------------------------|
| | |
| | |
| 3 | 4 |
| | |
| | |
| | |
|--------------------------------|-------------------------|

Frame one is a search form - by city, province and postal code. The
results are shown in frame 4. Frame 3 is a map and frame 2 is a static
frame.

How its working now:
Once the person submits their search methond and search string
(clicking on a submit button) frame 4 will list all the locations in
that province for them to view. If a person would like to map a
specific location from frame 4, they can click on a link and it will
map it in frame #3. (All done via PHP, MYSQL, HTML and GOOGLE's API)

What I would like to happen:
Upon clicking the submit button in frame 1 (ie. say they select
province), I would like frame 3 to map all of the results listed in
frame #4. The only way I can think of accomplishing this is by, having
frame 4 refresh frame 3 and append a URL encoded string with the
coordinates.

I am a newbie when it comes to javascript and I need some help to
confirm if the following is correct.

I have the following code at the end of Frame #4 - hoping that when it
finishes displaying the results, it will reload frame 3.
================================================== ===
FRAME 4 CONTENTS (frame4.php) // frame3 is the name of the frame
================================================== ===
<script language="JavaScript" type="text/javascript">

</script>
<body onLoad="javascript:refresh()">
================================================== =====

Can someone please point me in the right direction?
Thank you,
Jay Vee