[serzhman]

  var datalv:LoadVars = new LoadVars ();
  datalv.load("data.txt");
  datalv.onLoad =  function (success:Boolean) 
    {
   	if(success) 
              {  
                my_text.text = this.per1+this.per2;
              }
   }

А в data.txt:
per1=blablabla&per2=123