var asciiU = 85;
var asciiu = 117;
var ascii6 = 54; 

This is how you check inside the handleEvent() function:

if (window.event.keyCode == asciiU || 
    window.event.keyCode == asciiu || 
    window.event.keyCode == ascii8) 

Learn more about the Snakes game in Column 47, A DOM-Based Snakes Game, Part II .

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