this is my wapsite: http://game.mobifone.com.vn/
work correctly on many operating system, but Symbian s40 may get some error.
On footer div, i've used float:left to float <li> together, but it doesn't work on s40.
plz tell me why?
code below:

<div id="footer">
<ul class="footer_nav">
<li><a href="/">Trang chủ</a></li>
<li><a href="/listNews.html">Tin tức</a></li>
<li><a href="/listService.html">Dịch vụ</a></li>
</ul>
<span class="copyright">Copyright © 2012 Mobifone.</span>
</div>

and css:
#footer{padding:0em 1.5em;font-size:0.9em;float:left;}
ul.footer_nav{float:left;clear:none;display: block;}
ul.footer_nav li{float:left;padding:0em 1em;border-left:solid .1em #b4b4b4;list-style:none;line-height:100%;}
ul.footer_nav li:first-child{padding-left:0px;border-left:none;}
ul.footer_nav li a{color:#2964b6;text-shadow:1px 1px 0 #fff;}
#footer .copyright,{display:block;color:#9c9c9c;padding-top:.3em;clear:both;text-shadow:1px 1px 0 #fff; margin-bottom:.5em;}