function showHideMenu(liID, ulID) {
  var li = document.getElementById(liID);
  var ul = document.getElementById(ulID);

  if(ul.style.display == "none") {
    ul.style.display = "block";
    li.className = "menu-on";
  }
  else {
    ul.style.display = "none";
    li.className = "";
  }
}

function popWindow(url, winName, winWidth, winHeight) {
  var params = "width=" +winWidth+ ", height=" +winHeight+ ", top=100, left=100, status=no";
  window.open(url, winName, params);
}

function checkForm(theForm, errorTarget, errorColor) {
  formOK = true;

  for(i = 0; i < theForm.elements.length; i++) {
    theItem = theForm.elements[i];

    // text required
    if(theItem.className.indexOf('valid-content') >= 0) {
      pattern = /^(.+[\r\n]*)+$/;
    }
    // letters required
    else if(theItem.className.indexOf('valid-letter') >= 0) {
      pattern = /^[a-zA-Z\ ]+$/;
    }
    // number required
    else if(theItem.className.indexOf('valid-number') >= 0) {
      pattern = /^[0-9]+$/;
    }
    // email address required
    else if(theItem.className.indexOf('valid-email') >= 0) {
      pattern = /^[a-zA-Z0-9\_\-\.]+\@[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,4}$/;}
    // not required
    else {
      pattern = "";
    }

    if(pattern != "") {
      if(!pattern.test(theItem.value)) {
        formOK = false;
        theItem.style.backgroundColor = errorColor;
      }
      else {
        theItem.style.backgroundColor = "";
      }
    }
  }

  if(!formOK) {
    document.getElementById(errorTarget).style.display = "block";
    return formOK;
  }
}