function my_stateButton(   canvasName )

{

    this.canvas = document.getElementById(canvasName);

​

    this.canvas.onmousedown = this.onMouseDown;

    this.canvas.onmouseup = this.onMouseUp;

​

  console.log('constructing statebutton for id '+canvasName);

​

    // Do some work

}

​

my_stateButton.prototype.onMouseDown = function() {

   alert('down');

};

​

​

my_stateButton.prototype.onMouseUp = function() {

   alert('up');  

};

​

var btn1 = new my_stateButton( "Area-Light");