<html>
<head>
<script type="text/javascript">
function tree(treethis){
if (treethis.alt == "+"){
treethis.alt = "-";
document.getElementById("bench").style.display="block";
}else
{
treethis.alt = "+";
document.getElementById("bench").style.display="none";
}
}
</script>
</head>
<body>
<a href="javascript:void(0)" style ="text-decoration:none;color:red" onclick="tree(this);" alt="+">aaaa</a>
<span id="bench" style="display:none;margin-left:19px;">
<?php
$tree_bentch = array("aaa","bbb","ccc");
for ($i=0;$i<count($tree_bentch);$i++){
echo "<div>";
echo "<a href=\"http://www.baidu.com\">$tree_bentch[$i]</a>";
echo "</div>";
}
?>
</span>
</body>
</html>
