function validate( frm ) {

	var returnValue = false;

	if ( BlankField( frm.prefix.value ) ) {
		alert ( "Please select a prefix." );
		frm.prefix.focus();
	
	} else if ( BlankField( frm.first_name.value ) ) {
		alert ( "Please enter your first name." );
		frm.first_name.focus();
	
	} else if ( BlankField( frm.last_name.value ) ) {
		alert ( "Please enter your last name." );
		frm.last_name.focus();
	
	} else if ( !ValidEmail( frm.email.value ) ) {
		alert ( "Please enter a valid email address." );
		frm.email.focus();

	} else {
		returnValue = true;
	}
	
	return returnValue;

}

function show( opt ) {
	
	if ( opt.value == "2" || opt.value == "4" ) {
		
		document.getElementById( "ref_container" ).style.display = "block";
		
	} else {
		
		document.getElementById( "ref_container" ).style.display = "none";
		
	}
	
}