Javascript for check box list

See more:

ASP.NET

I have four check box list on my aspx page.
The scenario is that each check box list have check boxes with different-different value.
I want that when any user click on those check boxes then sum of value of all selected checkboxes if crosses 1 then it shows a message like that it exceeds 1

i am using the following javascript function

<script type="text/javascript" language="javascript">
        //-------------------function hardcode to perform on checklist box--------
        var total = 0;
        var histvalue = 0;
        var valueOfbx = 0;
        var currvalue = 0;
        function MutExChkList(chk) {
            if (chk.checked) {
                valueOfbx = 0;
                var chklst = chk.parentNode.parentNode.parentNode;
                var chkbx = chklst.getElementsByTagName("input");
                for (var i = 0; i < chkbx.length; i++) {
                    if ((chkbx[i].checked == true) && (chkbx[i].value != chk.value)) {
                        valueOfbx = Number(chkbx[i].value);
                        histvalue = -1;
                        chkbx[i].checked = false;
                    }
                    else if ((chkbx[i].checked == true) && (chkbx[i].value == chk.value)) {
                        currvalue = Number(chkbx[i].value);
                    }
                }
                total = total + currvalue;
                if (histvalue == -1) {
                    total = total - valueOfbx;
                    histvalue = 0;
                }
                if (total > 1) {
                    total = total - Number(chk.value);
                    chk.checked = false;
                    alert("exceeds");
                }
                else
                    chkbx[i].checked = false;
            }
            else {
                total = total - Number(chk.value);
            }
        }

    </script>

it works perfectly on my system but as i tried to work this on other systems then it does not value of checkboxes
Please help me


Thanks in advance