function var_dump(obj) 
{
   if(typeof obj == "object") 
   {
      return "Type: "+typeof(obj)+((obj.constructor) ? "\nConstructor: "+obj.constructor : "")+"\nValue: " + obj;
   } else {
      return "Type: "+typeof(obj)+"\nValue: "+obj;
   }
}

function isset(varname)
{
  return(typeof(varname)!='undefined');
}