<div class="center-buttons">
                    <a href="#" id="list_num" onclick="return list();" class="orange-btn-wide">
                        <img src="/images/img/img.png" alt="" height="60" width="60" /><span>Список</span></a>
     </div>

var ButtomTAG = document.getElementById("list_num").getElementsByTagName("span");
for (var i = 0; i < ButtomTAG.length; i++) {
    if (ButtomTAG[i].firstChild.textContent == "Список") {
        ButtomTAG[i].click();
        break;
    }
}