Contingency looping

[Von Karolyi, Catya]

Hi there,
    I'm new here and I apologize in advance for my ignorance and my
idiosyncratic jargon. I'm hoping someone can direct me to the most effective
way of accomplishing
a contingency loop. My situation is as follows:
     My goal is (1) to have a sequence of images (clunky animation) display
a morphed illusion and (2) to have participant input determine the follow-up
sequencing.
     In other words, the participant responds at any given point in the
original sequence (say, when two lines seem to be the same length) and is
redirected (Jumps to a Label?) to a customized sequence based on the point
at which the response occurred. The new sequence, for example, might start
at a point a few images further along in the sequence (when the two lines
are clearly not the same length) and back-up to (and beyond) the point of
the user's first input. (Or, conversely, back up a few images and redisplay
the same sequence).
      To accomplish the first part of this task, I've got a List that
repeatedly calls a Proc with a Slide Object set up with a generic image
holder on a single slide. The List specifies (calls) the original sequence
of bitmaps.
    I have failed to solve the second part of this task, even though I
attempted to write script 2 (for starters) InLine objects with different
sequences. I can make it vary the sequence using <Set> and <ExplicitOrder>,
but I don't know how to tell it "start with this bitmap, on the basis of
user input", I can't seem to control the flow correctly, and I can't seem to
get the Slide to actually take the user input and jump.
    I suspect that I'm asking for too much help. Nevertheless, I'd be
grateful for any tidbits you can throw my way. I'm a neophyte E-Prime user
and I'm waiting impatiently for a copy of VBA for Dummies to arrive in the
mail.
TIA,
Catya
PS The main frame computer can't seem to spell my last name correctly with a lower case "v"


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