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How to handle errors in dhtmlxAjax

Does dhtmlxAjax have support for Ajax error handling. For example, if the server code crashes, how do we know an error occurred? I have a servlet based server, which I can use to return various status codes. Does dhtmlxAjax allow me to check these codes, and perform appropriate client-side actions?

When used separately dhtmlxAjax doesn't provide any special error handlers, but you can use 

dhtmlxAjax.get(url,function(result){
     if (!result.xmlDoc.responseXML) alert(result.xmlDoc.responseText); //if xml is not valid - output response
    else{
       //default action
    }
});

more complex validation can be organized as 

dhtmlxAjax.get(url,function(result){
       result.getXMLTopNode("name_of_top_node");
      //default action
});

dhtmlxError.catchError("LoadXML",function(type,description,details){
      alert(details[0].responseText);
     ///code here will be called for all xml loading errors
})