function netscapeKeyPress(e) {

    if (e.which == 13)

        Calculate_Form();

}



function microsoftKeyPress() {

    if (window.event.keyCode == 13)

        Calculate_Form();

}



if (navigator.appName == 'Netscape') {

    window.captureEvents(Event.KEYPRESS);

    window.onKeyPress = netscapeKeyPress;

}



function y2k(number) { return (number < 1000) ? number + 1900 : number; }



function daysElapsed(date1,date2) {

    var difference =

        Date.UTC(y2k(date1.getYear()),date1.getMonth(),date1.getDate(),0,0,0)

      - Date.UTC(y2k(date2.getYear()),date2.getMonth(),date2.getDate(),0,0,0);

    return difference/1000/60/60/24;

}





function Reset_Result() {

  document.Form_Date_Difference.result.value = "";

}



function Calculate_Form() {

  var date_format = "%m/%d/%y";

  var firstObj, secondObj;

  with (document.Form_Date_Difference) {

    firstObj = buildDate(first_date.value,date_format);

    secondObj = buildDate(second_date.value,date_format);

  }



  if (!(typeof firstObj == "object")) {

    alert("The First Date is not in a valid format!!");

    return;

  }

  if (!(typeof secondObj == "object")) {

    alert("The Second Date is not in a valid format!!");

    return;

  }



  var days = daysElapsed(firstObj,secondObj);

  if (days < 0) { days *= -1; }



  var tempStr = "";

  if (days == 0) {

     tempStr = "Those dates are the same.";

  } else if (days == 1) {

    tempStr = "Those dates are 1 day apart.";

  } else {

    tempStr = "Those dates are " + days + " days apart.";

  }



  document.Form_Date_Difference.result.value = tempStr;

}