$(document).ready(function(){
    // date months offset by -1 because they're a zero-based array in JS
    var min_date = new Date();
    min_date.setFullYear(2009,8,1); 
    var max_date = new Date();
    max_date.setFullYear(2009,9,31);
    $('input[name^=request_date]').datepicker({ minDate:min_date, maxDate:max_date});
});