If you mean to change the url in the iframe, then you could use javascript or PHP. Something along the lines of:
Code:
document.getElementById(iframe).src="http://mywebsite.com/myvideofile/01.php";
where "iframe" is the id of your iframe (which you'll need to add).
Code:
<iframe src="http://mywebsite.com/myvideofile/error.php" name="frame1" scrolling="no" frameborder="no" align="center" height="420px" width="550px"id="iframe></iframe>
Also make the default page an error page, just to check to see if it works.
Now im not so hot with javascript, but you'll need to put that in a .js and use a script include on the bottom your page.
Code:
<script src="ifamejs.js" type="text/javascript></script>
*Untested* other fourm members feel free to correct
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