function searchOn(id,str) {
  // if the search text equals the default str
  if (document.getElementById(id).value == str) {
    // clear the search field
    document.getElementById(id).value = "";
  } document.getElementById(id).className = "txt on";
}

function searchOff(id,str) {
  // if the search text is blank
  if (document.getElementById(id).value == "") {
    // set search field to default string
    document.getElementById(id).value = str;
    // fade text
    document.getElementById(id).className = "txt off";
  }
}

function searchSubmit(id,str) {
  // if the search text equals the default str
  if (document.getElementById(id).value == str) { // don't submit form
    alert("Please enter a search term.");
    return false;
  } else return true;
}