Line 1 - The code from the previous section, to tell the content Mc to go to the label of 1st page of the site - "home"

Line 2 - A variable called current s created, which will hold the name of the button when it's pressed.

Line 3 - A boolean variable is created which we will use to see if the buttons needs to be moved.

Line 4 - Each button's Y position will be at 0, but when it's pressed it's going to slide up to position - 10. This value is held in "yMove".

Line 5 - The onPress function from the previous part.

Line 6 - An IF statement is created to check to see if the variable "current" is holding the name of the "this" (home_button). If it is, that mean the button is already at a Y position of -10, so we don't need to do anything.

Line 7 - If the variable "current" is holding the name of the "this" (home_button), we set current's Y position to 0. So if, for example, "current" was holding "media_button" and the home button is pressed, the "media_button" would move to a Y position of 0.

Line 8 - setMove is set to true, so we know that we can start moving the button (more will be explained further below)

Line 9 - the content MC is told to go to the label "home"

Line 10 - Since a new button has been pressed, current needs to be set to "this" (home_button)

Line 45 - an onEnterFrame function is created, which repeatedly executes the code between the braces {}

Line 46 - Now remember with each button onPress, we are setting "setMove = true"? With the onEnterFrame function we repeatedly check to see if this has happened, so we know when to move it up to -10 Y position.

Line 48 - Now remember with each button onPress, we are setting "setMove = true"? With the onEnterFrame function we repeatedly check to see if this has happened, so we know when to move it up to -10 Y position.

Line 49 - If setMove has been set to true, we now need to check if the button has reach a Y position of -10. If it hasn't we decrease the button (current) by 1 pixel repeatedly(--), until it's reached -10.

Line 50 -52 - When the button has reached -10, we change "setMove" to false, because we no longer need to move it.