function populate_dropoff(objForm,selectIndex) {
timeA = new Date(objForm.dropoff_year.options[objForm.dropoff_year.selectedIndex].text, objForm.dropoff_month.options[objForm.dropoff_month.selectedIndex].value,1);

timeDifference = timeA - 86400000;

timeB = new Date(timeDifference);

var daysInMonth = timeB.getDate();

for (var i = 0; i < objForm.dropoff_day.length; i++) {
objForm.dropoff_day.options[0] = null;
}
for (var i = 0; i < daysInMonth; i++) {
objForm.dropoff_day.options[i] = new Option(i+1);
}
document.f1.dropoff_day.options[0].selected = true;
}
function getYears() {

// You can easily customize what years can be used
var years = new Array(1997,1998,1999,2000,2001,2005)

for (var i = 0; i < document.f1.dropoff_year.length; i++) {
document.f1.dropoff_year.options[0] = null;
}
timeC = new Date();
currYear = timeC.getFullYear();
for (var i = 0; i < years.length; i++) {
document.f1.dropoff_year.options[i] = new Option(years[i]);
}
document.f1.dropoff_year.options[2].selected=true;
}
window.onLoad = getYears;