sigdig.as

			/* sigdig
			 *
			 * rounds the number to a specified number of significant digits
			 */
			['sigdig', false, function(setting, data) {
				
				if (typeof data[1] == "number") {
					var num_store = data[1],
						order = Math.ceil(Math.log( num_store )/Math.log(10)),		// get order of magnitude from log10
						n_down = num_store/Math.pow(10, order);						// drop down
					
					// now round, as above
					n_down = n_down * Math.pow( 10, setting );			// bring the decimal down for rounding
					n_down = Math.round(n_down);
					n_down = n_down / Math.pow( 10, setting );			// and back.
					
					//finally, undo the original transform
					data[1] = n_down * Math.pow( 10, order );
				}
				
				return data;
				
			}], //sigdig