autofil form server script

Hello i need a script which looks every 10 minutes at a website if there is a specific search term found. if not, it fills out a form on another website and submits it. the form consists of 4 simple text input fields (should be php) and a submit button. i can provide the source code for this form. what language its written in, is not important. it should run as a continous script on my webspace. my webspace supports everything. greetings Robert