Joomla Upgrade & PHP Scripts needed - repost

Existing secure website built on my Joomla Template is functioning well (V1.5.26). [login to view URL] I wish to upgrade to Joomla V.3 and make existing Template compatible for it, and also need simple PHP Scripts and Cookie development for this form, to make it uniquely customized when accessed via links I provide can provide to each introducing firm. These links will be embedded in their own websites and included in soliciting email campaigns. [login to view URL] This form is used for client application for participation in a financial product. I need PHP Script and Cookie development to run ahead of this RSFormPro component form to pre-populate certain fields that identify the origin of the Introduction. Simple job for someone familiar with PHP, Joomla, and RSFormPro. Located in GMT-4 time zone. Visit website for further contact information.