I want to create a script that will modify a website automatically through a cron job. The script will have designated and ultimately random keywords to interchange with words already in the webpage. For instance I may have a word "house" in the webpage and through this script I can exchange everyword "house" with a random word from a list associated with "house" in the script. I want to be able to do this for unlimited words but only on one page of the website (index). any help is appreciated.