Thank you once again for taking the time to try and unravel my problems!
I think I really get what you are saying, and I will try it out tomorrow. I think I am going to adapt my ideas a bit, as I think I am causing myself unnecessary problems with what I am trying to do. I think I might go back to the "scrolling bar with a mouse over event" which won't have a mask on it, that which is causing me so much stress!

Thanks again,

All the best,

Tom.