function STAFCheck (ReferenceName) {
    var emailexp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	with (document) {
	    with (getElementById('STAF_FN_' + ReferenceName)) {
	        value = trim(value);
	        if (value == '') {
	            alert ('Please enter your friend\'s name.');
	            focus();
	            return false;
	        }
	    }
	    with (getElementById('STAF_YN_' + ReferenceName)) {
	        value = trim(value);
	        if (value == '') {
	            alert ('Please enter your name.');
	            focus();
	            return false;
	        }
	    }
	    with (getElementById('STAF_FE_' + ReferenceName)) {
	        value = trim(value);
	        if (value == '') {
	            alert ('Please enter your friend\'s email.');
	            focus();
	            return false;
	        }
	        if (emailexp.test(value) == false) {
	            alert ('The e-mail address you have entered for your friend is not valid. Please correct.');
	            focus();
	            return false;
	        }
	    }
	    with (getElementById('STAF_YE_' + ReferenceName)) {
	        value = trim(value);
	        if (value == '') {
	            alert ('Please enter your email.');
	            focus();
	            return false;
	        }
	        if (emailexp.test(value) == false) {
	            alert ('The e-mail address you have entered for yourself is not valid. Please correct.');
	            focus();
	            return false;
	        }
	    }
        if (getElementById('STAF_MSG_' + ReferenceName) != null) {
            getElementById('STAF_MSG_' + ReferenceName).value = trim(getElementById('STAF_MSG_' + ReferenceName).value);
        }
	}
    return true;	
}

function STAFClear (ReferenceName) {
    with (document) {
        getElementById('STAF_FN_' + ReferenceName).value = '';
        getElementById('STAF_YN_' + ReferenceName).value = '';
        getElementById('STAF_FE_' + ReferenceName).value = '';
        getElementById('STAF_YE_' + ReferenceName).value = '';
        if (getElementById('STAF_MSG_' + ReferenceName) != null) {
            getElementById('STAF_MSG_' + ReferenceName).value = '';
        }
        if (getElementById('STAF_BD_' + ReferenceName) != null) {
			getElementById('STAF_BD_' + ReferenceName).value = '';
        }
    }
}