function build_option(sValue,select_id,isfirst)
{
	document.getElementById(select_id).innerHTML = "";
	if(!isfirst) document.getElementById(select_id).style.display = "" ;
	for( i=0 ; i < sValue.length - 1 ; i++ )
	{
		var sOption	= document.createElement("OPTION");
		sOption.text	= sValue[i]["n"];
		if(isfirst) sOption.value = i ;
		else sOption.value	= sValue[i]['k'];
		document.getElementById(select_id).options.add(sOption,i);
	}
}

function check_search_form(_this)
{
  if((_this.fieldtitle.checked == false) && (_this.fieldcontent.checked == false))
  {
    alert("您需要至少选定一种帖子类型");
    return false;
  }
}