function checkyep()
{


// check if name was entered
   if (document.forms[0].fname.value == '')
    {
        alert ('You have to enter your first name.');
        return false;

    }

// check if email was entered
        else if (document.forms[0].sname.value == '')
    {
       alert ('You have to enter your family name.');
	   return false;
	}


// check if email was entered
        else if (document.forms[0].email.value == '')
    {
       alert ('You have to enter a valid email address.');
	   return false;
	}



	return true;

}