var http_request = false;
   function makePOSTRequest(id,url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }

      //http_request.onreadystatechange = alertContents;
      http_request.onreadystatechange = function(){
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            var result = http_request.responseText;
            var tag_inicio='<inicio_resultado>';
            var tag_fin='<fin_resultado>';
			var inicio=result.indexOf(tag_inicio)+tag_inicio.length;
			var fin=result.indexOf(tag_fin);
            var o_body = result.substring(inicio,fin);
            document.getElementById('myspan_'+id).innerHTML = o_body;
            //Si el resultado es correcto borrar datos del formulario
            if(o_body.indexOf('form_ok')!=-1){
				document.getElementById('user_email_'+id).value="";
				document.getElementById('summary_'+id).value="";
				document.getElementById('captcha_value_'+id).value="";
            }
         } else {
            alert('There was a problem with the request.');
         }
      }

      }
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }



   function get(id,url,obj) {
	 var confirm_checkbox="";
	 if(document.getElementById("confirm_checkbox_"+id).checked==true){
		confirm_checkbox="&confirm_checkbox_"+id+"="+document.getElementById("confirm_checkbox_"+id).value;
	 }
      var poststr = "content_id=" + document.getElementById("content_id_"+id).value +
                    "&content_type=" + document.getElementById("content_type_"+id).value +
                    "&content_group=" + document.getElementById("content_group_"+id).value +
                    "&user_email=" + document.getElementById("user_email_"+id).value +
                    "&captcha_value=" + document.getElementById("captcha_value_"+id).value +
                    "&public_key=" + document.getElementById("public_key_"+id).value +
                    "&summary=" + document.getElementById("summary_"+id).value +
                    "&comment_submit_"+id+"=" + document.getElementById("comment_submit_"+id).value +confirm_checkbox;
      makePOSTRequest(id,url, poststr);
   }

  function showCommentsForm(id,first_class,second_class){
	var object=document.getElementById(id);
	if(object.className==first_class){
		object.className=second_class;
	}else{
		object.className=first_class;
	}
  }

  function changeObjectClass(id,classValue){
    var elemento=document.getElementById(id);
    if(elemento!=null){
    	elemento.className=classValue;
    }
  }