//Definizione della classe di gestione dei Layer
SkipperLayer.prototype.maxZoom	 	= null;
SkipperLayer.prototype.minZoom		= null;
SkipperLayer.prototype.visible  	= null;
SkipperLayer.prototype.shapes		= null;
SkipperLayer.prototype.loaded		= null;
SkipperLayer.prototype.topleft		= null;
SkipperLayer.prototype.bottomright	= null;
SkipperLayer.prototype.loadfunction	= null;

function SkipperLayer()
{
  this.minZoom       = 1;
  this.maxZoom       = 17;
  this.loaded        = true;  
  this.visible       = true;
  this.shapes        = new VEShapeLayer();
  this.topleft       = new VELatLong(0,0);
  this.bottomright   = new VELatLong(0,0);
}