gistfile1.js

function focusFirstInput() {
  var inputElements = document.getElementsByTagName('input');
  try {
    for (var i = 0; i < inputElements.length; i++) {
      var e = inputElements[i];
      // uses jQuery for hasClass()
      if (e.tagName == 'INPUT' &&
          !$(e).hasClass('nofocus') &&
          (e.type == "text" || e.type == "password") &&
          e.value === '') {
        e.focus();
        return;
      }
    }
  } catch (e) {} // in case IE gets angry
}
window.onload = focusFirstInput;