Problem with cursor position in inputbox when using plugin

Hi, we’re having a problem setting the cursor on the right position when using your plugin.
Let me explain: we use the plugin to show two tabs: one contains simple text, the other contains an iframe. THe iframe is used to give a visitor some inputboxes (name, country, phonenumber etc). This is developed in php. On the phonenumber it goes wrong. We use some standard code that shows the users a list of country codes, and checks validity of the phonenumbers.
Whenever we use your plugin to show that iframe on a 2nd tab (we tried on several sites, always the same result). the cursor for typing the phonenumber is not at the right place.
On other sites we use the same iframe but not with your plugin to create tabs, then the cursor is at the right position.
I can send you lots of links to see (or an image), but the problem is in a 3rd phase of a signup document so I can’t really send a link where it’s readily easy to see.