JSON cache(p, out_el, caching, callback, append, replace)
This helper function returns JSON with two attributes:
out_el - string | Output element ID
from_cache - bool | Is element returned from cache
p - string | URL
out_el - string | AJAX-response output element ID
caching - bool | JS-caching for current request
callback - string / function | Callback function after AJAX-request is successfully done
append - bool / string('prepend') | Append or Prepend to out_el element ID
replace - bool | If true element with id: out_el will be replaced by AJAX-response