Need Simple PHP/HTML Help

[basterache3]

I have 2 php variables and I need them to work with 2 frames:

<?
$var1 = "abc";
$var2 = "123";
///These are my two php variables
?>

I next have two frames like this:

<body>
<html>
<frameset rows="*,1" frameborder="no" border="0" framespacing="0">
  <frame src="http://xyz.com/" name="mainFrame" id="mainFrame" title="mainFrame" />
  <frame src="http://987.com" name="bottomFrame" scrolling="No" noresize="noresize" id="bottomFrame" title="bottomFrame" />
</frameset>
</html>
</body>

What I need to do is so that the First Frame Does not get its source from a website. I need to set the content of the first frame to be what is in $var1.

The second frame needs to get its content from the url given in $var2.