function openWin(pagina, nome,w,h)
{ 

     var
      x = Math.ceil( (window.screen.width - w) / 2 )
      ,y = Math.ceil( (window.screen.height - h) / 2 )
      ,tl = "top="+y+",left="+x+","
      ,nome="prodotto"
      ,aa = window. open(pagina,nome,tl+"toolbar=no,status=no,scrollbars=yes,resizable=no,menubar=no,width="+w+",height="+h); 
      aa.focus(); 

      return false;

}

var win = null;


function NewWindow(mypage,myname,w,h,scroll)
{
 LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
 TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
 settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable';
 win = window.open(mypage,myname,settings);
 if(win.window.focus){win.window.focus();}
}