Line 9: An onPress function is create for each thumbnail
Line 10: The last displayed image will be held in current, so we use this function to remove it before the new one is attached (line11), upon pressing the thumbnail
Line 11: We use the t.image property to attach the image to "imageHolder" MC. t.image is refered to as this.image because it's being called from withing an onPress function.
Line 12: When a thumbnail is rolled over with the mouse, the gallery will be pause (see next step), but when the thumbnail is pressed, we want them to start rotating again, so we set "pauseGallery" to equal false.