ajax - Problems with ajax_function i get an error -

hello stackowerflow people, ive got problem, im trying use 1 of community scripts, , cant find out problem. error ajax_function, how can solve it, or fix please help, here script:

<script> function editcolumn(dbc) {     var params  = 'option=edit&dbc=' + dbc ;     var divdbc = 'edit_' + dbc;     ajax_function('ajax_edit.php', params, divdbc); } function savecolumn(dbc) {     var value = document.getelementbyid('date_'+dbc).value;     var params     = 'option=save&value=' + value + '&id' + dbc ;     var divdbc = 'edit_' + dbc;     ajax_function('ajax_edit.php', params, divdbc); } </script> 

and here error get:

referenceerror: ajax_function not defined

how can possible create ajax function work script?

it means ajax_function() not declared or not found

find keyword in of files "function ajax_function()"

or

check if needs import script contains function ajax_function()

example:

<script src="thefile.js"></script>