I have always been able to code in html and css n whatnot, but now I have to venture into actually publishing a website thanks to the nature of my dissertation so I have created a site on zymic (sirgdissertation.zzl.org) and instructions told me to delete the default index.html file and replace it with my own.

However, I intend to call a php script - atm my 'home.php' file just has xhtml code in it - when users first click onto my website which redirects (if applicable) users to different versions of the website depending on what device they are using. So I presume (thanks to my noob-ness) that a simple .html file will cause the script to not be called.
Any suggestions as to how I can sort this out will be appreciated.
There should be no problems with the script itself as I obtained it after reading my 'Mobile Web Design for Dummies Book'.

problem sorted...I simply had to rename the home.php file to 'index.php'

its a common mistake on web hosting. just always remember that index.html or index.php is the start of your website or your home page.