Контроль суммы, от 1000 до 1999 и от 2000 и более

<div class="front_buttons">
  <table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0" id="billButtons" style="display: table;">
    <tbody>
      <tr valign="middle">
        <td style="padding-left:13px;">
          <div id="bill_sale_block"></div>
        </td>
        <td width="200" align="center">
          <div style="font-size:16px;">К оплате <b id="bill_total">890</b> руб.</div>
        </td>
      </tr>
      <tr height="50">
        <td>
          <div onclick="tooltip('bill_sale_tooltip',this);" class="btn bill grey persent"><span></span></div>
          <div id="bill_client_score" class="btn bill grey more" style="display:none;" onclick="">Счет
            <div class="mb"></div>
          </div>
        </td>
        <td align="right">
          <div onclick="orderSave();" class="btn bill save save" style="margin-right:10px; float:right;">Сохранить</div>
          <div onclick="billBasketClear();" class="btn bill grey trash" style="float:right;"><span></span></div>
        </td>
      </tr>
    </tbody>
  </table>
</div>

<div style="font-size:16px;">К оплате <b id="bill_total">890</b> руб.</div>

document.getElementsByClassName('item')[1].click();

document.getElementsByClassName('item')[2].click();