How to pass the parameters in transaction launcher

Hi,

  I Have a scenario i want pass the two parameters values dynamically, I am creating Transaction launcher in Non BSP URL.

  how to define the parameters for creating URL transaction Launcher

http://62.25.96.166/webfaults/requesttextupdates.php?number=07700700700&postcode=rg122up.

in this URL i want to pass the number and postcode values dynamically.

Please any one let me know how to create transaction launcher with parameters.