/* pager wrapper, div */
.tablesorter-pager {
  padding: 5px;
}
/* pager wrapper, in thead/tfoot */
td.tablesorter-pager {
  background-color: #e6eeee;
  margin: 0; /* needed for bootstrap .pager gets a 18px bottom margin */
}
/* pager navigation arrows */
.tablesorter-pager img {
  vertical-align: middle;
  margin-right: 2px;
  cursor: pointer;
}

/* pager output text */
.tablesorter-pager .pagedisplay {
  padding: 0 5px 0 5px;
  width: 50px;
  text-align: center;
}

/* pager element reset (needed for bootstrap) */
.tablesorter-pager select {
  margin: 0;
  padding: 0;
}

/*** css used when "updateArrows" option is true ***/
/* the pager itself gets a disabled class when the number of rows is less than the size */
.tablesorter-pager.disabled {
  display: none;
}
/* hide or fade out pager arrows when the first or last row is visible */
.tablesorter-pager .disabled {
  /* visibility: hidden */
  opacity: 0.5;
  filter: alpha(opacity=50);
  cursor: default;
}

<table class="tablesorter">
<!-- view page source to see the entire table -->
</table>

<!-- pager -->
<div id="pager" class="pager">
  <form>
    <img src="first.png" class="first"/>
    <img src="prev.png" class="prev"/>
    <span class="pagedisplay"></span> <!-- this can be any element, including an input -->
    <img src="next.png" class="next"/>
    <img src="last.png" class="last"/>
    <select class="pagesize">
      <option value="10">10</option>
      <option value="20">20</option>
      <option value="30">30</option>
      <option value="40">40</option>
    </select>
  </form>
</div>