function recRootNode (node, numbNode, obj, newNode){

        var number_of_nodes = node.childNodes.length;
        if ( !obj ) obj = document.body;
        for ( var i =  0  ; i < number_of_nodes ; i++) {
                var newChild        = false;
                var tagName         = node.childNodes[i].tagName || '';
                var numb_childNodes = node.childNodes[i].childNodes.length || '';
                var id              = node.childNodes[i].getAttribute('id');
                var value           = false;
                if ( node.childNodes[i].firstChild ) value   = node.childNodes[i].firstChild.nodeValue || false;

                if ( id != null || id == '' ) {
                        if ( id && document.getElementById(id) && document.getElementById(id).tagName.toLowerCase() == tagName ) {
                                var newObject = document.getElementById(id);
                        } else {
                                var newObject = document.createElement(tagName);
                                newChild = true;
                        }
                        if ( node.childNodes[i].attributes )
                        for ( var ii =  0  ; ii < node.childNodes[i].attributes.length ; ii++ ) {
                                var atributeName  = node.childNodes[i].attributes[ii].name;
                                var atributeValue = node.childNodes[i].attributes[ii].value;
                                if ( atributeValue != '' ) {
                                        set_atribute(newObject, atributeName, atributeValue);
                                }
                        }
                }
                if ( value ) set_atribute(newNode, tagName, value);
                if ( numb_childNodes >  0  && !value ) recRootNode(node.childNodes[i], numb_childNodes,newObject, newObject);
                if ( newObject && newChild ) obj.appendChild(newObject);
            }
        return ;
}

var xmldoc = seq.responseXML;
var root_nodes = xmldoc.getElementsByTagName("root")[ 0 ];
out = recRootNode(root_nodes); 

<?xml version="1.0" encoding="windows-1251"?>
<root>
      <div id="0.14656300 1165999404">
           <input id="catalogParent12_0.13948600" type="checkbox" name="catalogParent[]" value="12" onclick="check_other_checkbox(this.form,this)" checked="1"/>
           <input id="catalogParent48_0.13948600" type="checkbox" name="catalogParent[]" value="48" onclick="check_other_checkbox(this.form,this)"/>
      </div>
</root>

<input type="checkbox" name="name" value="value" checked>

<INPUT id="catalogParent12_0.13948600" type=checkbox tname="catalogParent[]"/>
<INPUT id="catalogParent48_0.13948600" type="checkbox" />

if (newNode)
        switch (tagName) {
                case 'innerHTML':
                                 newNode.innerHTML += value;
                                 break;
...
                case 'onchange':
                                 newNode.onchange      = function () { eval(value) };
                                 break;
                case 'onclick':
                                 //newNode.attachEvent("onclick",function(){eval(value)});
                                 newNode.onclick      = function () { eval(value) };
                                 break;
...
                default :
                                 if (newNode)newNode[tagName] = value;
        }
}
_____

<root>
<div id="0_14656300_1165999404">
<input id="catalogParent12_0_13948600" type="checkbox" name="catalogParent[]" value="12" onclick="fn()" checked="1"/>
<input id="catalogParent48_0_13948600" type="checkbox" name="catalogParent[]" value="48" onclick="fn()"/>
</div>
</root>

<root>
<div id="0_14656300_1165999404">
<innerHTML>text1</innerHTML>
<input id="catalogParent12_0_13948600" type="checkbox" name="catalogParent[]" value="12" onclick="fn()" checked="1"/>
<innerHTML>text2</innerHTML>
<input id="catalogParent48_0_13948600" type="checkbox" name="catalogParent[]" value="48" onclick="fn()"/>
</div>
</root>

var id              = node.childNodes[i].getAttribute('id');
if ( node.childNodes[i].firstChild ) value   = node.childNodes[i].firstChild.nodeValue || false;
if ( id != null || id == '' ) {
   if ( id && document.getElementById(id) && document.getElementById(id).tagName.toLowerCase() == tagName ) {
      var newObject = document.getElementById(id);
   } else {
      var newObject = document.createElement(tagName);
     newChild = true;
   }
...
}

if (newNode)
        switch (tagName) {
                case 'innerHTML':
                                 newNode.innerHTML += value;
                                 break;
...
                case 'onchange':
                                 newNode.onchange      = function () { eval(value) };
                                 break;
                case 'onclick':
                                 //newNode.attachEvent("onclick",function(){eval(value)});
                                 newNode.onclick      = function () { eval(value) };
                                 break;
...
                default :
                                 if (newNode)newNode[tagName] = value;
        }