function menu (menu)
{
	var mbox = document.getElementById(menu);
	if (mbox.style.display=='block')
		mbox.style.display = 'none';
	else
		mbox.style.display = 'block';
}

function show (name)
{
	var el = document.getElementById(name);
	if (el.style.display=='none')
		el.style.display='block';
	else
		el.style.display='none';
}

function validate_email(form)
{
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var email = document.getElementById(form).email.value;
   if(reg.test(email) == false) 
   {
      alert('Please enter a valid email address');
      return false;
   }
   else
	return true;
}