More than one password :

• Yes, it is possible !
• But for each password must exist its target (secret page).
• Two & more passwords cannot take user to the same page.

If you want to have more than one password, modify script in this way :
»»» ADD new condition If (OutString == "new_number")

Original script, added new condition

  if (OutString == "10009804" )
    {
  window.open ( newlocation, "_new", "resizable=1, toolbar=0, location=0, menubar=0, status=0");
    }
    else
    {
     if (OutString == "new_number")
       {
     window.open ( newlocation, "_new", "resizable=1, toolbar=0, location=0, menubar=0, status=0");
       }
       else
       {
    alert("ACCESS DENIED");
       }
    }

Each opened "{" must be close with "}" ... so count it carefuly !