function checkEmailForm()
{
   if ( document.getElementById('full_name').value == "")
   {
	   alert('Please enter your full name');
	   document.getElementById('full_name').focus();
	   return false;
   }

   else if ( document.getElementById('email_address').value == "")
   {
	    alert('Please enter your email_address');
	    document.getElementById('email_address').focus();
	    return false;
   }

   else if ( document.getElementById('tel_number').value == "")
   {
	    alert('Please enter a telephone number');
	    document.getElementById('tel_number').focus();
	    return false;
   }

    else if ( document.getElementById('comments').value == "")
   {
	    alert('Please enter some comments');
	    document.getElementById('comments').focus();
	    return false;
   }
   else
        return true;
}