checkbox 다 중 선택 상자 연동 실현 코드

<input type="checkbox" name="father" forcheckboxgroup="groupname1"/> 

<input type="checkbox" name="son" group="groupname1"/> 

<script type="text/javascript"> 
function CheckboxGroup(){ 
var arrelement = document.all; 
var i=0; 
while(i<arrelement.length){ 
var forgroupattrib = arrelement[i].getAttribute('forcheckboxgroup'); 
if(forgroupattrib != null && forgroupattrib != ''){ 
arrelement[i].setAttribute('groupmember',_getGroupMember(arrelement[i])); 
if(arrelement[i].tagName.toLowerCase() == 'input' && arrelement[i].type == 'checkbox'){ 
arrelement[i].onclick=function(){ 
//----------------------Checked All------------------ 
var groupmember = this.getAttribute('groupmember'); 
var i = 0; 
while(i<groupmember.length){ 
groupmember[i].checked = this.checked; 
i++; 
} 
//--------------------------------------------------- 
} 
} 
_setState(arrelement[i]); 
} 
i++; 
} 
} 

function _getGroupMember(o){ 
var groupname = o.getAttribute('forcheckboxgroup'); 
var items = new Array; 
var inputs = document.getElementsByTagName('input'); 
var i=0; 
while(i<inputs.length){ 
if(inputs[i].type == 'checkbox'){ 
var groupattrib = inputs[i].getAttribute('group'); 
if(groupattrib == groupname){ 
items[items.length] = inputs[i]; 
var master = inputs[i].getAttribute('groupmaster'); 
if (master == null) { 
master = new Array; 
master[0] = o.uniqueID; 
inputs[i].setAttribute('groupmaster', master); 
} 
else{ 
master[master.length] = o.uniqueID; 
} 
inputs[i].onpropertychange = function(){ 
if (event.propertyName == 'checked') { 
var arro = this.getAttribute('groupmaster'); 
var i = 0; 
while (i < arro.length) { 
_setState(document.getElementById(arro[i])); 
i++; 
} 
} 
} 
} 
} 
i++; 
} 
return items; 
} 

function _setState(o){ 
var master = o; 
if(master!=null){ 
var chkselall = true; 
var chknosel = true; 
var groupmember = master.getAttribute('groupmember'); 
var i = 0; 
while(i<groupmember.length){ 
if(chkselall)chkselall = groupmember[i].checked; 
if(chknosel)chknosel = !groupmember[i].checked; 
i++; 
} 
if(master.tagName.toLowerCase() == 'input'&&master.type=='checkbox'){ 
if (chkselall) { 
master.indeterminate = false; 
master.checked = true; 
} 
if (chknosel) { 
master.indeterminate = false; 
master.checked = false; 
} 
if(!chkselall&&!chknosel)master.indeterminate = true; 
} 
else{ 
master.disabled = chknosel; 
} 
} 
} 

window.attachEvent('onload',CheckboxGroup); 
</script>