It's extremely unlikely that you will find a pre-made script that will do this, but the good news is that what you want would be a very simple thing to code. What you need is a database set up to contain the information. Since the station probably has a set schedule for it's on-air talent you would need to set up the administrative section in a day of the week/time of day arrangement with the corresponding talent information linked to that. Then when the page is requested the script would check the current time and select from the database the information for that time slot and add it to the page and send it to the user.
If you use a freelance site like http://getafreelancer.com or one of the many others I'd expect this to cost you about $20 to have written.