WP-PrettyPhoto Youtube Linking not working

Ok… I’ trying to link this you tube video
http://www.youtube.com/watch?v=dZe1AeH0Qz8
to a thumbnail of the video as seen in my blog
http://blog.glenfordlaughton.com/?p=1606
when I select the “insert link” button to insert the url of the video everything seems fine until I update the post. Then the link seems to revert from this
<img class=”aligncenter size-full wp-image-1642″ title=”gasland” src=”http://blog.glenfordlaughton.com/wp-content/uploads/2011/01/gasland.png&#8221; alt=”” width=”379″ height=”236″ />

to this
<img class=”aligncenter size-full wp-image-1642″ title=”gasland” src=”http://blog.glenfordlaughton.com/wp-content/uploads/2011/01/gasland.png&#8221; alt=”” width=”379″ height=”236″ />

HELP!!!