function abreise(sType) {
    var default_difference = 21;
    var duration = 0;

/*    var value = (document.forms[sType].mmc.
	   options[document.forms[sType].mmc.selectedIndex].value);
	switch(value) {
		case "0": duration = 0; break;
		case "1-5t": duration = 5; break;
		case "1w": duration = 7; break;
		case "6-8t": duration = 8; break;
		case "9-12t": duration = 12; break;
		case "2w": duration = 14; break;
		case "13-16t": duration = 16; break;
		case "3w": duration = 21; break;
		case "17-22t": duration = 22; break;
		case "4w": duration = 28; break;
		case "27-28t": duration = 28; break;
		default: duration = 0; break;
	}
*/
	var difference = default_difference + duration;

	if (document.forms[sType].bsd.selectedIndex <
	   (document.forms[sType].vnd.selectedIndex + difference)
	) {
		if ((document.forms[sType].vnd.selectedIndex + difference) <=
		  document.forms[sType].bsd.options.length
		) {
			document.forms[sType].bsd.selectedIndex =
			     document.forms[sType].vnd.selectedIndex + difference;
		} else {
			document.forms[sType].bsd.selectedIndex =
			     document.forms[sType].bsd.options.length - 1;
		}
	}
}