$(document).ready(function(){
    $("#datepicker").datepicker({ changeMonth: true,
                                  changeYear: true,gotoCurrent: true,
                                  numberOfMonths: [1,1],
                                  minDate:0,
                                  dateFormat: 'yy-mm-dd',
                                  altField: '#startdate',
                                  onSelect: function(dateText, inst){
                                    if($("#datepicker").datepicker("getDate")>$("#datepicker2").datepicker("getDate"))
                                      $("#datepicker2").datepicker("setDate",$("#datepicker").datepicker("getDate"));

                                      $("#datepicker2").datepicker('option','minDate',$("#datepicker").datepicker("getDate"));
                                  }});

    $("#datepicker2").datepicker({ changeMonth: true,
                                   changeYear: true,
                                   numberOfMonths: [1,1],
                                   minDate:0,
                                   dateFormat: 'yy-mm-dd',
                                   altField: '#enddate',
                                   defaultDate: +1,
                                   onSelect: function(dateText, inst){
                                     if($("#datepicker").datepicker("getDate")>$("#datepicker2").datepicker("getDate"))
                                      $("#datepicker").datepicker("setDate",$("#datepicker2").datepicker("getDate"));

                                      $("#datepicker").datepicker({minDate: $("#datepicker2").datepicker("getDate")});
                                   }});
});//End document ready