Shockwave code on page altered upon re-edit

I have some Shockwave code embedded on a page (see 1st set of code below) and when I re-edit the page, the code changes and strips out the Shockwave code. It only seems to be a problem in IE7, but that’s what me client uses, so if anyone know a fix (other than upgrading IE) that would be very helpful.

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<div><embed style="width: 660px; height: 250px;" src="http://static.issuu.com/webembed/viewers/style1/v1/IssuuViewer.swf"></embed></div>
<div style="width: 660px; text-align: left;"><a href="http://issuu.com/ilanabit/docs/ggp_scrapbook1010?mode=embed&layout=http%3A%2F%2Fskin.issuu.com%2Fv%2Flight%2Flayout.xml&showFlipBtn=true" target="_blank">Open as PDF</a></div>
<strong>A History of the Downtown Columbia Project</strong>