code: function decimal(_num, _precision) {
  
  	// If _num is undefined, assing 0	
  	if(_num === undefined) _num = 0;
  	
  	// If _precision is undefined, assigned 2
  	if(_precision === undefined) _num = 2;
  
      n = Math.abs(_num);
      
      var sign = '';
      if(_num < 0)
      	sign = '-';
      	
      return sign + n.toFixed(_precision);
  }
docs: Returns a string of a number with the given presicion.
  
  @param {Number} _num
  @param {int} _precision
  @api public