function prefDisp( objForm, strCtype ){

  prefGrand(objForm, strCtype);
  prefParent(objForm, strCtype);
}
function prefGrand(objForm, strCtype)
{
  if (strCtype==''){ return; }

  objGrand     = objForm.g;
  objSelParent = objForm.selparent;
  objCtype     = objForm.ct;
  urlGrand     = "/xml/category_grand_partner.xml";
  objSelParent.value='';
  objCtype.value=strCtype;
  clearDisp(objGrand);

  switch (strCtype){

    case "0":
      urlGrand  = "/xml/category_grand_partner.xml";
      break;
    case "20":
      urlGrand  = "/xml/category_grand_white_paper.xml";
      break;
    case "30":
      urlGrand  = "/xml/category_grand_seminar.xml";
      break;
    case "10":
      urlGrand  = "/xml/category_grand_community.xml";
      break;
    default:
      urlGrand  = "/xml/category_grand_partner.xml";
      break;

  }
  urlGrand =  urlGrand+"?rand=" + Math.random(); //乱数を付加

  getselect(urlGrand,objGrand,'','grand_name','grand_id');

}
function prefParent(objForm, strCtype)
{

  objGrand     = objForm.g;
  objParent    = objForm.p;
  objSelParent = objForm.selparent;
  objCtype     = objForm.ct;
  intGid       = objGrand.value;
  strSel       = objSelParent.value;

  if (strCtype=='') { strCtype=objCtype.value; }
  if (intGid=='')   { intGid='0'; }

  urlParent    = "/xml/category_parent_partner_g_"+intGid+".xml";
  clearDisp(objParent);

  switch (strCtype){

    case "0":
      urlParent = "/xml/category_parent_partner_g_"+intGid+".xml";
      break;
    case "20":
      urlParent = "/xml/category_parent_white_paper_g_"+intGid+".xml";
      break;
    case "30":
      urlParent = "/xml/category_parent_seminar_g_"+intGid+".xml";
      break;
    case "10":
      urlParent = "/xml/category_parent_community_g_"+intGid+".xml";
      break;
    default:
      urlParent = "/xml/category_parent_partner_g_"+intGid+".xml";
      break;

  }
  urlParent = urlParent+"?rand=" + Math.random(); //乱数を付加

  getselect(urlParent,objParent,strSel,'parent_name','parent_id');

}
function getselect(url,objSelect,strSel,strTag1,strTag2)
{
  var paramList = "";
  new Ajax.Request(url,{
      method: 'get',
      onSuccess: getData,
      onFailure: showErrMsg(objSelect),
      parameters: paramList
    }
  );
  function getData(data){
    var response = data.responseXML;

    var items=response.getElementsByTagName("items");

    var catename=response.getElementsByTagName(strTag1);
    var cateid=response.getElementsByTagName(strTag2);
    for( i = 0 ; i < items.length ; i++ )
    {
      var text  = catename[i].firstChild.nodeValue;
      var value = cateid[i].firstChild.nodeValue;
      objSelect.options[i]=new Option(text,value)
      if (strSel==value){
        objParent.options[i].selected=true;
      }
    }
  }
  
  function showErrMsg(objSelect){
    clearDisp(objSelect);
  }
}
function clearDisp(objSelect){
  var optionIndex = objSelect.length;
  for ( i=0 ; i <= optionIndex ; i++ ){
    objSelect.options[0]=null;
  }
}