code: function(pos) {
      var props = {};
      if(pos.indexOf('top') !== -1) {
        props.top = this.options.pos_margin;
      } else if(pos.indexOf('bottom') !== -1) {
        props.bottom = this.options.pos_margin;
      }
  
      if(pos.indexOf('left') !== -1) {
        props.left = this.options.pos_margin;
      } else if(pos.indexOf('right') !== -1) {
        props.right = this.options.pos_margin;
      }
      this.$el.css(props);
  
    }
docs: set position based on a string like "top|right", "top|left", "bottom|righ"...