Переход на нужную страницу для переключателя

<div class="pageselect">  
  <form name="pageselect" onsubmit="spages(pagenumberb,'2');return false" method="get">  
  Перейти на страницу:  
  <input onchange="changenumber();return proverka(this)" onkeyup="return proverka(this)" onkeypress="return testKey(event)" type="number" name="pageSelector" maxlength="3" min="1" max="$NUM_PAGES$" size="7" >  
  <input type="submit" value="GO"> из <b>$NUM_PAGES$</b>  
  </form>  
  </div>  

  <script type="text/javascript">  
  var numberofpage='$CURRENT_PAGE$'; var replacednumber = 0; var pagenumberb = 0; replacednumber = numberofpage.replace('<span class="currentPage79">', ''); replacednumber = replacednumber.replace('</span>', ''); document.forms['pageselect'].elements['pageSelector'].value = replacednumber;  
  function testKey(e){ var key = (typeof e.charCode == 'undefined' ? e.keyCode : e.charCode);  
  if (e.ctrlKey || e.altKey || key < 32)  
  return true; key = String.fromCharCode(key); return /\d/.test(key);}  
  function proverka(input) { input.value = input.value.replace(/[^\d,]/g, '');};  
  function changenumber() {pagenumberb = document.forms['pageselect'].elements['pageSelector'].value;}; </script>

maxlength="3"