volani funkce

//index.php

<div id="zmiz">
      <script type="text/javascript">
       
          zobraz();
        
        </script>
        <p>
          tady je text...    
        </p>
</div>

//script.js

var pridano=false;
function pridat(){
  pridano=true;
}
function zobraz(){
  if(pridano){
    $(document).ready(function(){
          $("#zmiz").slideUp("slow");
          pridano=false;
      });
  }
}

//index.php?page=nekde
<form action="index.php?page=nekam">
<input type="submit" onclick="pridat()" value="1" /> 
</form>

//index.php?page=nekam

<?php
header(location: index.php);
?>