When creating links to Multimedia Manager you must link to a channel, a folder, or a media object in the Multimedia Manager, and something will always begin playing when you click the link. However, there is a workaround that may resolve this issue.
Create a slideshow with a single image in it, such as your school logo or static instructions on how to use the player and the navigation. Place the slideshow by itself in a channel you create, and link to that channel.
This will cause the Media Player to play the static, single-image slideshow. Since there is only one image in the slideshow, it will appear that the Media Player has stopped, giving you the effect you need. Viewers can then browse the other channels seen in the navigation.