iframe is disappearing in php website

Hi,

I've been trying to troubleshoot this iframe issue all day. I need help. First, the issue is an iframe on the frontpage is to load a php script for an Video ad. Second the frontpage is a php search script. Now, when you visit the frontpage initially everything is working fine; iframe on the frontpage loads and the video ad loads as well, bravo so far. Then the probably shows itsself when you click on another nav link and you either hit the back button on the browser or the link to get back to the frontpage the iframe has vanished.

Has anyone run across this sort of issue? I've tried to use Javascript to do a reload of the browser, but no luck.

Thanks for any advice

URL: https://www.searchmedicals.com/