interactive schedule - selecting a date

I've been given the task of developing an online schedule for reserving
equipment at our school. We have two laptop carts that teachers must reserve
if they need to use them. Currently, this is done by signing a log sheet
kept in the lab. We would like to make this accessible through our intranet.

This is how I envision it working:

I would create a database to hold the info and create a web page to display
the info.

I want the first page to show the current schedule and the times that have
already been reserved. This would pretty much look like the current log
sheet being used.

I want to provide a form that could be filled out and submitted to reserve a
time.

Most of this I should be able to do without a problem. There is one aspect I
need help with. I have seen a feature on many web sites where the user can
click to bring up an actual calendar that they use to select a date. I'm
assuming this is done with JavaScript, but I'm not sure. Is there a script
available that would popup a calendar and then insert the selected date into
the form field? I tried searching for it but wasn't sure what to call it.

Thanks for any help.