Stop for loop and run other function on Button Click using jQuery in ASP.Net

Hi friends,

how to stop or kill  current function method and run other method using thread or without thread concepts.

i ll uploading more than 1000 images with progressbar, its working fine.

but suppose if i cancel then i need to stop that uploading function and need to run other function to cancel

issue is

ex: 1st method for loop running long process

2nd method (cancel) is to cancel that for loop execution