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Just a cross-browser interpretation, only returns true or false, though.
Description: Function that returns true when a specific node lies within the node tree of another.
Syntax: contains(in Node, reference Node)
function contains(a, b) {
for(var i = a.childNodes, x = 0; x < i.length; x ++)
if(i[x] == b || (i[x].hasChildNodes() && contains(i[x], b)))
return true;
return false;
}
Example:
<html>
<head></head>
<body>
<div><span id="der"></span></div>
<script type="text/javascript">
<!--
var i = document.getElementById("der");
if(contains(document.getElementsByTagName("div")[0], i))
i.appendChild(document.createTextNode("Text"));
//-->
</script>
</body>
</html>
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