1function $(el) { 2 return document.getElementById(el); 3} 4 5function $F(el) { 6 return $(el).value; 7} 8 9function bind(obj, func) { 10 return function() { 11 return func.apply(obj, arguments); 12 }; 13} 14 15function childNodeWithClass(node, className) { 16 var expression = ".//*[@class='" + className + "']"; 17 return document.evaluate(expression, node, 18 null, XPathResult.ANY_TYPE, null).iterateNext(); 19}