API XML application implemented in website

Hi there A client of me has a vacation rental website. On the homepage at the moment they have a search engine (you can search for destination, number of rooms, dates, rates etc.), it's an Iframe. This is the first important thing. Two things more are important on this website: on pages with the listings there are for every listing 2 links: one is 'check availability' and the other one is 'reserve now or get a quote'. Both these links bring you to the page of the company who made the reservation/booking software. In fact these 3 things; the Iframe and the 2 links ('check availability' and 'reserve now or get a quote') is what needs to be changed. My client now switched over to another company who made the reservation/booking software for her. Because of this the search function(Iframe) and the 2 other links has to be changed. All the software, database etc is ready, I only have to implement the xml api codes into the website. This new company gave me all the code that I need, but it is xmlapi , I don't know about this. The attached document has all the comments and codes, for the website I only need the following: 1. through XML API there has to come a search function on the homepage, similar like the one that is on now. Visitors must be able to search for: - development - dates (availability calendar) - bedrooms -nightly rates 2. Each listing page has a link to the availability calendar and to the reservation/booking page, see [login to view URL] you can see, in the menu on the right middle of the page. At the moment the website is written in PHP. Again, I only want you to implent the XMLAPI codes, I will atach them, on the homepage (search function), and I only want you to make the 2 links 'check availability' and 'reserve now or get a quote' work on 1 page only. In the attached document you will find, besides the XML API codes, more info about the website I'm talking about, and which 2 pages exactly need to be changed. So you only have to change 2 pages, the homepage and 1 page of one of the listings. Thanks, Michel