var passx='xaviborras';
function pasextre() { 
var pre = "";
  var pre = prompt("Entra el password","");
  if (pre == passx)
	//window.open('extres/extres.htm','extres','width=450,height=300,resizable=yes,menubar=no');
		window.location.href = 'extres/extres.htm';
  else
	alert ("Password incorrecte");
 }