Try this:

http://hardware.hardwarestore.com/27...t--108068.aspx

or these:
http://www.mcfeelys.com/product.asp?pid=0710-TSO
You should be able to find trim head screws at your local home center.
You will probably need a square drive screewdriver to install them.
Try in the closet first to see if they will mangle your carpet.