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The YouTube Code that You Use has Problems with FireFox as it sends the Error Message; I've tried the Code with the one I use on my Forums and Changed a little the code to include the resizing of the embed Tag and it works Fine on FireFox.

This is the Modified Code:

<table class="tborder" cellpadding="6" cellspacing="1" border="0" width="425" style="margin:10px 0">
<thead>
	<tr>
		<td class="tcat" colspan="2" style="text-align:center">
			<span style="float:right;margin-left:5px;cursor:pointer;font-weight:bolder;" title="Increase this video's size" onClick="
				if ( this.innerHTML == '+' ) {
					this.innerHTML = '-';
					this.title = 'Reset video size';
					this.parentNode.parentNode.parentNode.parentNode.width=638;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('object')[0].width=638;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('object')[0].height=515;

	this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].width=638;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].height=515;

				} else {
					this.innerHTML = '+';
					this.title = 'Increase this video\'s size';
					this.parentNode.parentNode.parentNode.parentNode.width=425;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('object')[0].width=425;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('object')[0].height=355;

this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].width=425;
					this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].height=355;

				}
			">+</span>
			<a href="http://www.youtube.com/watch?v={param}" title="View this video at YouTube in a new window or tab" target="_blank">YouTube Video</a>
		</td>
	</tr>
</thead>

<tbody>
	<tr>
		<td class="panelsurround" align="center">


<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/{param}"></param><embed src="http://www.youtube.com/v/{param}&autoplay=0&fs=1&rel=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="355" wmode="transparent"></embed></object>


		</td>
	</tr>
</tbody>
</table>

Notice the Followinnf Changed Code:

this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].width=638;

this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].height=515;

this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].width=425;

this.parentNode.parentNode.parentNode.parentNode.getElementsByTagName('embed')[0].height=355;

<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/{param}"></param><embed src="http://www.youtube.com/v/{param}&autoplay=0&fs=1&rel=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="355" wmode="transparent"></embed></object>

My Best Regards.