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

  }

  function changeAllClassByName(name,classValue){
	var hijos=document.getElementsByName(name);
    for(i=0;i<hijos.length;i++){
      changeClass(hijos[i].id,classValue);
    }
  }

function sendAjaxFormSubmit(url, divid, idform)
{
	var req = getXMLHttpRequest();
	var formobj= document.getElementById(idform);
	req.onreadystatechange = function(){ processResponse(req, divid) };
	req.open("POST", url, true);
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	var params = "content_id="+formobj.content_id.value+ "&content_type=" + formobj.content_type.value+ "&content_group=" + formobj.content_group.value;
	params =params+"user_email="+formobj.user_name.value+"&comment_submit_"+formobj.content_id.value+"=true";
	req.setRequestHeader("Content-length", params.length);
	req.send(params);
}
function changeChildrenClass(parent_id,class_value){
	var parent=document.getElementById(parent_id);
    for(i=0;i<parent.children.length;i++){
     var id=parent.children[i].id;
     changeClass(id,class_value);
    }
}