<div id="loginForm">
<ul class="sign-in-form">
<li><input type="text" name="username"/></li>
<li><input type="password" name="password"/></li>
<li>
<input type="submit" onclick="loginForm()" value="click" />
</li>
</ul>
</div>
<script>
function loginForm() {
document.getElementById("loginForm").click();
}
</script>