Check if date and time is between two date and times

This javascript code checks whether the checkDate is between beginDate and endDate and generates a MessabeBox

function dateWithin(beginDate,endDate,checkDate) {
 var b,e,c;
 b = Date.parse(beginDate);
 e = Date.parse(endDate);
 c = Date.parse(checkDate);
 if((c <= e && c >= b)) {
  return true;
 }
 return false;
}

// This will alert 'false'
alert(dateWithin('12/20/2007 12:00:00 AM','12/20/2007 1:00:00 AM','12/19/2007 12:00:00 AM'));

Thanks

Happy Programming.