no alert?

[dude1x]

I have this code and it doesn't seem to alert the fact that I'm pressing a key (this should happen after I click Start). Why? :/

function dynamic_buttons() {
    var start_button = document.getElementById('start');
    var stop_button = document.getElementById('stop');
    start_button.onclick = log_keypress;
    stop_button.onclick = log_keypress;
    }
 
function log_keypress() {
    alert('click event happened'); 
    }

And here's the "whole" code: code

[dude1x]

done. i forgot calling it :) thank you