I am having  date/time field in my database in which

there is diff. times/date . I want that at the given

time entered by user a mail/sms should be sent to the

user.

  How can I have that autoexecute in my script. so

that every time script executes automatically after a

period and if there is any user then message is

invoked.



   My site is hosted on other web server.





      Himanshu