How to add gameobject inside of an array?

Hello,

I have a script that renders an object I click on, as "selected".

How can I add all the objects I select on an array, and then remove them when the variable "selected" is false?

This is the script that the objects have:

 //more stuff...

 var selected : boolean;
 function OnMouseUp() {
     selected = true;
 }

 //more stuff...