code: function indent(extra) {
    			if (!this.multiline) {
    				return "";
    			}
    			var chr = this.indentChar;
    			if (this.HTML) {
    				chr = chr.replace(/\t/g, "   ").replace(/ /g, "&#160;");
    			}
    			return new Array(this.depth + (extra || 0)).join(chr);
    		}
docs: Extra can be a number, shortcut for increasing-calling-decreasing