defaultSearchText = 'Search pitches...';

function defaultText() {
  document.getElementById('searchbox').value = defaultSearchText;
}

function searchText(theField) {
  if(theField.value == defaultSearchText) {
    theField.value = '';
  }
  else if(theField.value == '') {
    theField.value = defaultSearchText;
  }
}

window.onload = defaultText;