gistfile1.js

control = {
    32  : go_up,  
    46  : go_down 
};

$(document).bind("keydown", function(e) {
    console.log("keydown: ", e.keyCode);
    if(!control[e.keyCode]) {
        return;
    }
    control[e.keyCode].call();
});


function go_up() {
    alert("UP");
}

function go_down() {
    alert("DOWN");
}