Need Wordpress Hack for Iframes Code

Hi there. I use Wordpress right now - and so far - I have like 30 pages with iframe code from YouTube and other sources. However - Wordpress strips my PHP code when I switch from HTML view to the VISUAL. So I need a solution that allows me to paste the HTML code in the page in both visual and html and nothing strips it! My goal is for this: My copywriter needs to come in and edit the 30 pages by putting text above and below the iframes.. He needs to be able to do that.. save the file.. and it work. Thanks! Kit