Check members of object

function dumpProps(obj, parent) {
   // Go through all the properties of the passed-in object 
   for (var i in obj) {
      // if a parent (2nd parameter) was passed in, then use that to 
      // build the message. Message includes i (the object's property name) 
      // then the object's property value on a new line 
      if (parent) { var msg = parent + "." + i + "\n" + obj[i]; } else { var msg = i + "\n" + obj[i]; }
      // Display the message. If the user clicks "OK", then continue. If they 
      // click "CANCEL" then quit this level of recursion 
      if (!confirm(msg)) { return; }
      // If this property (i) is an object, then recursively process the object 
      if (typeof obj[i] == "object") { 
         if (parent) { dumpProps(obj[i], parent + "." + i); } else { dumpProps(obj[i], i); }
      }
   }
}

With this function we can check what one object content.