I have a website built in wordpress with a link to my shopping site, when a user clicks on this link, I would an Ajax (or similar nice looking) window to appear on the page asking for a valid ABN (Australian Business Number). User will need to enter a valid ABN before he gets taken to the linked url (to my shopping site). Preferably, at the same time, I would like an email to be sent to me with the abn number (same way how a contact form works).
I'll prefer respondents who give an example of how the window to enter abn would look like. The change is straightforward and I need it done within couple of days.