I'm not familiar with ActionScript, but there's an easy way to do this using the Advanced Actions in Captivate. Here's how I would approach it. First, create six variables, one for each of the six respective slides, so you could create variables called v_slide1_viewed, v_slide2_viewed, v_slide3_viewed, v_slide4_viewed, v_slide5_viewed, and v_slide6_viewed. Set their default values equal to 0 (I usually prefix my variables with v_ to distinguish from the inbuilt Captivate variables).
Now on slide 1, set an On Enter property to assign the value 1 to the variable v_slide1_viewed. This means, that when slide 1 loads, the variable 'v_slide1_viewed' will be set to 1. Similarly do this for each of the six respective slides.
Now on the abbreviation slide, create a SmartShape (Continue) button and uncheck the 'Visible in Output' so that by default this button is not displayed. Now you can write an advanced actions (conditional) script that says if
v_slide1_viewed = 1 AND
v_slide1_viewed = 2 AND
v_slide1_viewed = 3 AND
v_slide1_viewed = 4 AND
v_slide1_viewed = 5 AND
v_slide1_viewed = 6
Then Show and select the smartshape ID or whatever you named that object.
Hope this is what you were looking for.
-Sean