Making Heartbeat Line Loop continuously

Please help me out anyone!,

Im trying to make a heartbeat line loop continuously without going away.
I added the .FLA file, im sure there is an easy solution i just can’t figure it out by myself :(.
U see that the line will be eaten when the mask has completely scrolled over my line. I want to prevent it from being eaten and start over again without having the old line dissapear.

Thanks in advance

Here is the link to my .FLA:

http://members.lycos.nl/infernalmajesty/Banner_Beta.fla