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how to pass text set in a javascript?

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In my php page, I have this text area whose text data I want to pass to the php code set in the action field. 
This is working, when I type something in the area. 
But then, I placed a little button below the text area, so that if a user clicks on it, an example text gets on there. 
Then, I expect that if I click on the submit button, the example text is passed to next.php . 
But I find it not working. 

OK, let me summarize with a code snippet. 

<script type="text/javascript"> 
<!-- 
function loadExample() { 
document.forms["region"].elements['fgData'].value = "asdf"; 
alert("asdf"); 
} 
//--> 
</script> 

<form name="region" action="calculator_sub.php" method="post" enctype="multipart/form-data" target="_self"> 
<textarea id="fgData" name="fgData" class="xxlarge" rows="10" disabled="disabled"> </textarea> 
<input type="button" value="Example load" onclick="loadExample();"> 
<input type="submit" class="btn primary" id="submit_button" value="Submit"> 
</form> 

The button actually puts "asdf" on fgData text area. 
But when I do 
<?php 
echo "<pre>"; 
print_r($_POST); 
echo "</pre>"; 
?> 

in next.php, there isn't even a variable named fgData. 
What am I missing to pass the data? 

Thanking in advance, 
Justpark. 

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how to pass text set in a javascript? thejustpark <thejustpark@gmail.com> - 2012-08-15 18:34 -0700
  Re: how to pass text set in a javascript? thejustpark <thejustpark@gmail.com> - 2012-08-15 21:24 -0700

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