function isDate(c){var b=/^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;var a=c.match(b);if(a==null){return false}day=a[1];month=a[3];year=a[5];if(month<1||month>12){return false}if(day<1||day>31){return false}if((month==4||month==6||month==9||month==11)&&day==31){return false}if(month==2){var d=(year%4==0&&(year%100!=0||year%400==0));if(day>29||(day==29&&!d)){return false}}return true}function regExCheck(b,a){var c=b.match(a);if(c==null){return false}return true}function tbCheckLength(d,e,f){if(d.value.length==f){e.focus()}};