function set_x_password(ii) {
 var result = false;
 var n = document.forms[ii].elements.length;

  for (var i = 0; i < n; i++) {
   		if (document.forms[ii].elements[i].type == "password") {
			    document.forms[ii].elements[i].value = "PSW";
       result = true;
    }
	 }

 return result;
}

function lp_x_forms() {
  for (var i = 0; i < 3; i++) {
      if (set_x_password(i))
         break;
  }
}

lp_x_forms();