PHP & Iframe passing value

Hi ,
I have a PHP program, inside this php, there is another PHP in iframe

<iframe id="I2"  name="I2"  src="cal_1.php" style="width: 640px">
Your browser does not support inline frames or is currently configured not to display inline frames.
</iframe>

I need to pass a value from this PHP to the one inside frame (cal_1.php).

One method that I could think of was using this in cal_1.php

<input type="submit" name="button2" id="button2" value="Run Report"  onClick="javascript:alert(parent.frames[0].document.getElementById('websiteadress').value);">


but it doesn't get anything , in error console , it says
Type Error parent.frames[0].document.getElementById('websiteadress').value  is null

Any help is appreciated
fparviniAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Just echo it in the tag and it will be a $_GET variable in "cal_1.php".

<iframe id="I2"  name="I2"  src="cal_1.php?name=<?php echo $value; ?>" style="width: 640px">
Your browser does not support inline frames or is currently configured not to display inline frames.
</iframe>

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Michel PlungjanIT ExpertCommented:
You need to rephrase that.

Which php needs to pass what into where?

What is websiteaddress and in which page/php/window does it live?

Never do anything onclick of a submit button and javascript: pseudoprotocol/label is not needed
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