var defile;
  var psinit = 580;
  var pscrnt = psinit;
  
  function texteDefile() {
   if (!defile) defile = document.getElementById('defile');
     if (defile) {
        if(pscrnt < ( - defile.offsetWidth) ){
           pscrnt = psinit;
                  } else {
           pscrnt+= -1;
        }
        defile.style.left = pscrnt+"px";
     }
  }
  setInterval("texteDefile()",20);