You need to identify the top first, and go from there.
Here's a page that may help
If it's a factory top, you can buy a "Replace-A-Top" which will reuse the hardware, but give you all new fabric and windows.
If it's a replacement Supertop, you -may- be able to buy Replacement Skins (depends on the year).
If it's a budget brand, like Pavement Ends, you may not be able to replace the fabric.
If you need to replace the whole thing, there are lots of options.