Thanks a lot, I will try to find out what is and how to use an iframe. Yes as you correctly assumed I have designed the layout.
The reason I did not begin to code it in WordPress from the beginning is, first of all I had no experience with it before and I thought it would be difficult and complex to design and tweak my layout. Secondly the website consists of 9 static web pages and 1 dynamic. So I was thinking that I could create my own php dynamic page as it is only one but I had never done that before and I realised that it would be time consuming. Then I learned about WordPress and its CMS capabilities.