ck_max=10;
function chg(){
	v=0;
	for (i=0; i<ck_max; i++){
		if (document.ckform.elements[i].checked){
			v++;
		}
	}
	if (v < 4) {
		var check = 1;
	} else if (v > 3 && v < 8) {
		var check = 2;
	} else {
		var check = 3;
	}
	for (i=1; i <= 3;i++) {
		id = document.getElementById('check' + i);
		if (check == i) {
			id.innerHTML = '<a href="./result.php?check=' + i + '"></a>';
			var back = 'url(img/result' + i + '_on.gif)';
		} else {
			id.innerHTML = '';
			var back = 'url(img/result' + i + '_off.gif)';
		}
		id.style.backgroundImage = back;
	}
}
window.onload = chg;