Sorry for late reply I had the velcro sewn around the curtain and used the adhesive style to attach to window frame
just make sure and clean frame good and it should stay put
On a side note I got tired of curtains and leaking windows so i am having the windows fiberglassed in as we speak
Mine have tracks with snaps around them. I'm in the process of replacing the curtain with new fabric and old mounting. Checkout Sailrite.com for hardware and sewing supplies. Didn't like any fabric I found there. Wife is still mad at me for stealing her new shower curtain to make new curtains!