OnClick，按Enter搜索

Question

点击“输入”而不是单击放大镜后如何获得要搜索的页面？

<div class="Search">
  <div class="input-append">
    <div style="float:left; margin-left:165px; margin-right:2px;">
      <a href="http://shesaurus.com/">
        <img
          alt="Home"
          width="39px"
          height="39px"
          src="http://shesaurus.com/assets/images/home.png"
        />
      </a>
    </div>
    <input
      class="span5"
      id="appendedInput"
      name="appendedInput"
      type="text"
      placeholder="What's another word for...?       Be sure to click the magnifying glass!"
    />
    <a href="#" onclick="searchWord('','','home');">
      <img src="http://shesaurus.com/assets/images/searchbt.jpg" />
    </a>
    <div class="arrow-down" />
  </div>
</div>

我希望用户能够点击“输入”以获得结果。