function checkAge()
{
	var min_age = 18;
	
	var day = parseInt( document.getElementById('m4_32_1' ).options[document.getElementById( 'm4_32_1' ).selectedIndex].value );
	var month = parseInt( document.getElementById('m4_32_2' ).options[document.getElementById( 'm4_32_2' ).selectedIndex].value );
	var year = parseInt( document.getElementById('m4_32_3' ).options[document.getElementById( 'm4_32_3' ).selectedIndex].value );	
	
	var guest_date = new Date( year, month, day );
	var check_date = new Date;
	
	check_date.setYear( check_date.getFullYear() - 18 );
	
	if( guest_date <= check_date )
	{
		return true;
	}
	else
	{
		alert( "Je moet 18 jaar of ouder zijn!" );
		return false;
	}
}