chart

function Chart() {
}
Chart.prototype = {
  l_gutter:      120,
  l_margin:       20,
  r_margin:       20,
  r_gutter:       80,
  x_bound:       900,

  t_gutter:       20,
  t_margin:       10,
  b_margin:       10,
  b_gutter:       80,
  y_bound:       500,

  tick_length:     8,
  tick_offset:     2,
  x_label_offset: 38,
  y_label_offset: 24,

  raphael: function() {
    if (this.__raphael) {
      return this.__raphael;
    }
    this.__raphael = Raphael('holder',this.x_bound,this.y_bound);
    return this.__raphael;
  }

};