function apri(link)
{
if (navigator.userAgent.indexOf("Win") != -1)
{
 if ((navigator.userAgent.indexOf("Mozilla") != -1) && (navigator.userAgent.indexOf("MSIE") == -1))
 {   
 if (screen.width == 800) window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=190,top=85')
    else
        if (screen.width > 800) window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=302,top=185')
 } 
 if (navigator.userAgent.indexOf("MSIE") != -1)
 {
  if (screen.width == "800") window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=190,top=85')
    else
        if (screen.width > "800") window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=302,top=185')
 } 
 }
 else if (navigator.userAgent.indexOf("Mac") != -1)
 {
 
 if (screen.width == 800) window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=190,top=85') 
    else
        if (screen.width > 800) window.open(link,'principale','height=430,width=430,toolbar=no,menubar=no,status=yes,directories=no,location=no,resizable=NO,marginwidth=0,marginheight=0,left=302,top=185')
 }
}