function setDays(form){ year = parseInt(form.year.options[form.year.selectedIndex].value); month = form.month.selectedIndex; day = form.day.selectedIndex; form.day.options.length = 0; var days = new Array(31, ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0 ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); for(i = 0; i < days[month]; i++) { form.day.options.length = form.day.options.length + 1; form.day.options[i].value = i + 1; form.day.options[i].text = i + 1; } form.day.selectedIndex = (day < form.day.options.length) ? day : form.day.options.length - 1;} JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember123456789101112131415161718192021222324252627282930198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030