Simple PHP ad rotation

A simple ad rotation program written in php, which uses a simple text file to revolve your ads. You can use this script to rotate any thing, all you have to do is place the contents in a text file (the content in the text file will be seperated by ~ sign) the script imports the contents of the file and saves it into an array by seperating the contents by "~" sign you put. then a randon number is choosen and array[random number] is displayed on the site.