Hello:
jQuery EasyUI 1.3.1 with Mozilla FireFox 15.9 or 16.0 this windows dont show centered horizontally, in Chrome or IE 8 work fine.
With jQuery EasyUI 1.3.0 work fine in FF.
<div id="#fm_login" class="easyui-window" title="Login" iconCls="icon-login" collapsible="false" minimizable="false" maximizable="false" closable="false" style="width:350px;height:auto;padding:5px;background:#D8D8D8">
<form id="fm_login" method="POST" ACTION="Sys_users/Login">
<br>
<div class="fitem">
<label>Usuario:</label>
<input name="q_usr_id" >
</div>
<div class="fitem">
<label>Clave:</label>
<input name="q_usr_key" TYPE=PASSWORD>
</div>
<div id="dlg-buttons" align="center">
<br>
<a href="#" class="easyui-linkbutton" iconCls="icon-ok" style="text-align:center;" onclick="loginSubmit()">Ingresar</a>
</div>
</form>
</div>
</body>