frm.town.options[0].selected=true;

function selChange(seln) {
	selNum = seln.town.selectedIndex;
	Isel = seln.town.options[selNum].text;
	switch(Isel)
	{
	 	case "Санкт-Петербург": window.location="http://sewprice.ru"; break;
	 	case "Москва":  window.location="http://msk.sewprice.ru"; break;

	}

}