iWeb crashes when adding an HTML snippet

[maclover001]

Whenever I insert an HTML snippet into iWeb and click "Apply", the entire thing locks and gives me that spinning beachball thing and I have to force quit. I lost about 2 hours of work because of this (My fault, should have saved)

What could be causing this? This is the exact code I tried to paste:

<applet id='ProjectApplet' style='display:block' code='ScratchApplet' codebase='http://scratch.mit.edu/static/misc' archive='ScratchApplet.jar' height='387' width='482'><param name='project' value='../../static/projects/g8rghr/320402.sb'></applet> <a href='http://scratch.mit.edu/projects/g8rghr/320402'>

What could cause this?

Thanks

PS: Save all of your open documents.