URGENT Wordpress Expert for website addon

Hi, We need someone who knows wordpress quite well, we have something like this on our site: In our SEO website I have different packages and buttons of Paypal to pay for them, once some one click on it site takes the person to a form where they fill up all the details required for that package (like, First & Last Name, then website, keyword, url to use, email id, and auto calculation sytem which calculate the quantity with per price which is based on ajax [i think] .etc) and under this there a Paypal button which take him to Paypal for paying… Now my problem is i changed my wordpress theme and now this function is stop working specially auto calculation system. i dont know which file i have to move in new theme folder. i need a person who fix this problem for me I hope I am able to make things clear, please do not bid if you are not experienced in wordpress, Write “Details Form” at the beginning of your PM.