<INPUT type="hidden" name="a_" id="a_" value="48851"> <INPUT type="hidden" name="b_" id="b_" value="1812"> <INPUT type="hidden" name="c_" id="c_" value="487">
document.getElementById('a_').value = 53494 + 1*142; document.getElementById('b_').value = 13208 + 2*(142+3); document.getElementById('c_').value = 142 + 3 - 6;