/* KNOB */
		  
		function init_knob() {
		
				if( typeof ($.fn.knob) === 'undefined'){ return; }
				console.log('init_knob');
	
				$(".knob").knob({
				  change: function(value) {
					//console.log("change : " + value);
				  },
				  release: function(value) {
					//console.log(this.$.attr('value'));
					console.log("release : " + value);
				  },
				  cancel: function() {
					console.log("cancel : ", this);
				  },
				  /*format : function (value) {
				   return value + '%';
				   },*/
				  draw: function() {

					// "tron" case
					if (this.$.data('skin') == 'tron') {

					  this.cursorExt = 0.3;

					  var a = this.arc(this.cv) // Arc
						,
						pa // Previous arc
						, r = 1;

					  this.g.lineWidth = this.lineWidth;

					  if (this.o.displayPrevious) {
						pa = this.arc(this.v);
						this.g.beginPath();
						this.g.strokeStyle = this.pColor;
						this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, pa.s, pa.e, pa.d);
						this.g.stroke();
					  }

					  this.g.beginPath();
					  this.g.strokeStyle = r ? this.o.fgColor : this.fgColor;
					  this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, a.s, a.e, a.d);
					  this.g.stroke();

					  this.g.lineWidth = 2;
					  this.g.beginPath();
					  this.g.strokeStyle = this.o.fgColor;
					  this.g.arc(this.xy, this.xy, this.radius - this.lineWidth + 1 + this.lineWidth * 2 / 3, 0, 2 * Math.PI, false);
					  this.g.stroke();

					  return false;
					}
				  }
				  
				});

				// Example of infinite knob, iPod click wheel
				var v, up = 0,
				  down = 0,
				  i = 0,
				  $idir = $("div.idir"),
				  $ival = $("div.ival"),
				  incr = function() {
					i++;
					$idir.show().html("+").fadeOut();
					$ival.html(i);
				  },
				  decr = function() {
					i--;
					$idir.show().html("-").fadeOut();
					$ival.html(i);
				  };
				$("input.infinite").knob({
				  min: 0,
				  max: 20,
				  stopper: false,
				  change: function() {
					if (v > this.cv) {
					  if (up) {
						decr();
						up = 0;
					  } else {
						up = 1;
						down = 0;
					  }
					} else {
					  if (v < this.cv) {
						if (down) {
						  incr();
						  down = 0;
						} else {
						  down = 1;
						  up = 0;
						}
					  }
					}
					v = this.cv;
				  }
				});
				
		};
		
		$(document).ready(function() {
			init_knob();
		});