// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults
var delta=0;
var inizio=0;
var pos=inizio;
var boxheight=400;
function muovi() {
scrollheight= document.getElementById('page_text').offsetHeight;
	if (scrollheight <= boxheight) {
		fine=0;
	}
	else {
	  fine=-(scrollheight-boxheight);
	}
    if (((pos==fine)&&(delta==-1))||((pos==inizio)&&(delta==1))) delta=0;
   pos=pos+delta;
    document.getElementById('page_text').style.top=pos + "px";
    if (delta!=0) setTimeout('muovi()',10);
  }