whats wrong wif this???

whats wrong with this piece of code?

Code:

---

var formLen=document.forms[0].length;
var stopNum=formLen-1;
               
for(var a=0;a<stopNum;a++)
{
        document.forms[0].elements[a].checked=getCookie(document.forms[0].elements[a].name);
}

---

if say, i check a checkbox, then uncheck it. I go to another page and return, the value should be false, but somehow it always goes to true.

Any checkbox that I check and then uncheck will go back to being checked

ANyone can help?