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$("span > img:not(:first)").remove();
<body>
<span id="ss"><img src="img/111.jpg" width="300" height="200" border="0" alt=""/><img src="img/11.jpg" width="300" height="200" border="0" alt=""/><br/><img src="img/22.jpg" width="300" height="200" border="0" alt=""/><br/><img src="img/11.jpg" width="300" height="200" border="0" alt=""/><br/><img src="img/22.jpg" width="300" height="200" border="0" alt=""/></span>
<input type="button" value="Click" onclick="del()"/>
<script type="text/javascript">
<!--
function del(){
var a = $("span > img");
alert(a.length);
for (var i=1;i<a.length ;i++)
{
a[i].removeNode(true);
}
}
//-->
</script>
</body>