if (elename.equalsIgnoreCase("back") || elename.equalsIgnoreCase("1"))
return "<a href=\"javascript:window.history.back()\">后退</a>";
else if (elename.equalsIgnoreCase("refresh")
|| elename.equalsIgnoreCase("2"))
return "<a href=\"javascript:window.history.go(0)\">刷新</a>";
else if (elename.equalsIgnoreCase("print")
|| elename.equalsIgnoreCase("3"))
return "<a href=\"javascript:window.print();\">打印</a>";
return "";
向上：
<div id=demo style="overflow:hidden; width:128px; height:300px;">
<div id=demo1>
<img src="/gfjs.gif"><br><img src="/bxtt.gif"><br><img src="/bzjd.gif"><br>
<img src="/gfjs.gif"><br><img src="/bxtt.gif"><br><img ......
