Limiting Course Navigation

Greetings! I've just started "playing" with Storyline (coming over from Presenter 09)and I've come accross an issue I can't seem to figure out.

Is there a way to "lock" the Sidebar menu so that a learner can not navigate forward until the current side has been completed?

Our courses are requred to to contain slides which must be on screen for a specified amount of time and the learner may not advance to the next slide until the current one has "expired".  They can, however navigate backwards to past slides.

Thanks again!

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