Make a Clickable LInk that Loads Search Results

IMPORTANT: Please review the details below. This project may be IMPOSSIBLE. Or it may be EASY. I don't know. One developer provided a solution, but it involves changing the code in the head section of the end-user's website. That's no good. Please message me with an explanation of how you can solve this problem. --- I have a working PHP app "TagSearch". It is wrapped to be a WordPress Plugin. If I am interested, I will send you the files. TagSearch is a search engine for music tracks that connects to SoundCloud via API. TagSearch is hosted on a developer server at: [login to view URL] After customizing settings, the user may embed TagSearch their own site with iFrame, e.g. as I have done here: [login to view URL]!library/cqn3 User can search by entering text in the search field, or by check boxes next to filter labels. There is a button "Get Link". Get Link is supposed to work like this: Clicking "Get Link" offers a link that the user can paste into an email. When the receiver of the email clicks that link, it should lead to the page where TagSearch is embedded (e.g. [login to view URL]!library/cqn3), then load exactly the same text into the search field (if any), and exactly the same set of check boxes (if any). The current version of the code has the "Get Link" function, but it does not work correctly. Currently, when you click on the link, it takes you back to [login to view URL], instead of the site where the app is embedded. Also, the current version only works for the check boxes, but not for the text in the search field. You will modify the code so that GetLink works correctly - the generated link leads to the end user site (not the developer site), and includes the search text as well as the check boxes. You will post the modified TagSearch script on your developer server for testing. If you have any questions, post them here on Freelancer and I will answer as quickly as possible.