id number selector problem

id number selector problem

hi, i have a problem using attribute start with selector on my jquery-ui dialog form, i have multiple id's with number as an differentiator
  1. id="dialog-form-1"
  2. id="dialog-form-20"
then i used this selector
  1. $("[id^='dialog-form']")
but why selector not working when the id number is a multiple of 10?