...
function keydown(e)
{
	if (false) {
	} else if (e.ctrlKey && (e.keyCode == 112)) { // red button
		document.getElementById('link-speedtest').focus();
	} else if (e.ctrlKey && (e.keyCode == 113)) { // green button
	} else if (e.ctrlKey && (e.keyCode == 114)) { // yellow button
	} else if (e.ctrlKey && (e.keyCode == 115)) { // blue button
		document.location.reload(true);
	} else {
		return false;
	}
}
set_kinput(keydown);

function set_kinput(keydown, keypress, keyup, keychar)
{
	var kinput = document.getElementById('kinput');
	if (keydown) kinput.onkeydown = keydown;
	if (keypress) kinput.onkeypress = keypress;
	if (keyup) kinput.onkeyup = keyup;
	if (keychar)
	{
		kinput.onkeypress = function(event)
		{
			var char = undefined;
			if (event.type == 'keypress')
			{
				char = null;
				if (event.which == null) { // IE
					if (event.keyCode >= 32) char = String.fromCharCode(event.keyCode);
				} else if (event.which != 0 && event.charCode != 0) { // все кроме IE
					if (event.which >= 32) char = String.fromCharCode(event.which);
				}
			}
			return keychar(char);
		};
	}
	kinput.focus();
}