[Deff]

<a href="site/category-1-2" onclick="return transformUrl(this);">Еще</a>

<script type="text/javascript">
 function transformUrl(a){
  var href = a.href;
  var ar = href.split('-');
  var basic = ar[0];
  var Numb1 = +ar[1];
  var Numb2 = +ar[2];
  Numb1++;
  a.href = basic+'-'+Numb1+'-'+Numb2;
  $('div#lenta_podgruzka').load(a.href+' .lenta');
  return false; //не удаляем
 } 
</script>