Here's two scrolling projects that might help, try downloading them and looking at their scripts.
http://scratch.mit.edu/projects/archmage/145760
http://scratch.mit.edu/projects/archmage/82995
You could also try reading these..
http://scratch.mit.edu/projects/Rukqo/115602
http://scratch.mit.edu/projects/tro95/203675
Hopefully those'll work
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