php - i want the iframe to show only if -

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i have iframe, have embedded onto production site. still working on here iframe table results

the problem don't want 1 see it, wondering there way add link look's like.

http://www.chessbook.net/zulutestingsite/index.php?option=com_chess&id=350**&result**

that way when add &result it'll show iframe below iframe code on page

<div>    <iframe src="http://users.hellzoneinc.com/eric258/preview.php" width="50%"             height="300" scrolling="auto" frameborder="0" name="results">     </iframe> </div>

you should below:

 <?php if(isset($_get['result']) or $_get['result'])=='your_some_value'){?> <div> <iframe src="http://users.hellzoneinc.com/eric258/preview.php" width="50%" height="300" scrolling="auto" frameborder="0" name="results"> </iframe> </iframe>         </div>  <?php }?>

and url should 

http://www.chessbook.net/zulutestingsite/index.php?option=com_chess&id=350&result=your_some_value

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