disable other checkboxes if 3 checkboxes are checked

[al3bed]

hello

im newbie here :) im not good in javascript but i need this code
i want a function check if 3 checkboxes are checked
and if they checked then it's will disable other checkboxes!

as i say im not good in javascript.. this is my try:


function check_disable(box) {

var index = 0;

for(var i=0;i<box.form.elements.length;i++)
{
if(box.form.elements[i].checked == true)
{index = index + 1;}
else if(box.form.elements[i].checked == false)
{index = index - 1;}
}

if(index >= 3)
{
for(i=0;i<box.form.elements.length;i++)
{
box.form.elements[i].disabled = !box.checked;
}
}
}
-->
</script>


i put onclick="check_disable(this);" in each checkbox
this not work :o

any help please
thanks

[al3bed]

i found the answer :D

solved