The ratio of the viewport (i.e. screen) to the image height should be the same as the ratio of the scrollbar height to the height of the scrollbar container.
Similarly the position of the viewport (as a proportion of the image size) should be the same as the position of the scrollbar (as a proportion of the size of its container).
Maybe you want to figure the rest out for yourself, so I'll leave it here. Let me know if you want more help.
|Response Title||Author and Date|
|Ok...||Zack on Jan 2|
|What exactly is the problem?||on Jan 2|
|Uh||Zack on Jan 2|
|You could use a string text array||on Jan 2|
|Thanks||Zack on Jan 3|
|Uh, one more question||Zack on Jan 3|
|_MOUSEWHEEL resets to 0 after you read it||on Jan 3|