function aprifinestra()
{
	(document.getElementById) ? dom = true : dom = false;
	if (dom) {document.getElementById("popup").style.visibility='visible';}
	if (document.layers) {document.layers["popup"].visibility='show';}
	setTimeout('chiudifinestra()', 30000)
}
function chiudifinestra()
{
	(document.getElementById) ? dom = true : dom = false;
	if (dom) {document.getElementById("popup").style.visibility='hidden';}
  	if (document.layers) {document.layers["popup"].visibility='hide';}
}
function aprichat()
{
	window.open("prechat.php", 'chat');
}


(document.getElementById) ? dom = true : dom = false;

window.onscroll = window_onscroll;


function window_onscroll() {

  var el = document.getElementById('popup');

  if(el!=null)
  {
	
	var s;

	if (self.pageYOffset){
	s = self.pageYOffset;
	}else if (document.documentElement && document.documentElement.scrollTop) {
	s = document.documentElement.scrollTop;
	}else if (document.body) {
	s = document.body.scrollTop; 
	}else {
	s = document.body.scrollTop; 
	}

    if(typeof(document.media)=='string')
    {
		el.style.top = + s;
    } else {
		el.style.top = + s + 'px';
    }

    
  }
}