Javascript/aspx call server side function with parameter

Question

This is my JavaScript code and I want to send parameter to the function instead of "7789" to send the var: nalogID I have tried only with __doPostBack('updatePrikaceniDoc', nalogID); but it does not work so I don't know what to do now.

   function update(nalogID) 
                <%updatePrikaceniDoc("7789")%>
                __doPostBack('updatePrikaceniDoc', nalogID);
            }