problems embedding you tube video

Hi,

Can you help me..?

Every time I try to embed a you tube video in a post, I follow the instructions on you tube, copy the relevant code, size it to width 470 (which I need for my post page width, then the only way I am able to get it to embed is to paste it into my post while in the HTML mode.

I then update the post & the the video is embedded.

If I then at a later date, try to add any further text to the post page, (which I usually would do do in non HTML mode), the video I posted earlier disappears when I update the post to include my newly added text.

Any tips you could give me would be greatly appreciated.

Thank you for taking the time to help me, Tom.