[Skyld]

Use function prototyping:

PHP Code:

MuteButton.onMouseDown = function ()
{
  //
}; 


PHP Code:

function onCreated()
{
  this.onWeaponFired = function ()
  {
    //
  }
}; 


Or even standard function definition:

PHP Code:

function MuteButton.onMouseDown()
{
  //
}