document.getElementById('a1').onmouseover =	function () { f(1,1); };
document.getElementById('a1').onmouseout =	function () { f(2,1); };
document.getElementById('a2').onmouseover =	function () { f(1,2); };
document.getElementById('a2').onmouseout =	function () { f(2,2); };
document.getElementById('a3').onmouseover =	function () { f(1,3); };
document.getElementById('a3').onmouseout =	function () { f(2,3); };