pretty cool idea
in the help menu search for pop-up text box - in the returned topics go to the topic "layers, mouseover, pop-up"
scroll down to pop-up layers and follow that except instead of making a rectangle and typing text for your pop-up (their example) drag your mp4 onto your new popup layer selecting auto start
position it over your Learn to Enroll
hide the pop-up layer and go back to the mouse off layer
right click on your text box
select web properties>link tab>pop-up layer>choose your pop-up layer from the list and then click on the settings box to the right and DE-SELECT close popup automatically
apply settings and test 'er out
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