JavaScript DHTML/Node Operation/getElementsByTagName
"getElementsByTagName()" Example
<html>
<body>
<script language="JavaScript">
function function1() {
var m = document.getElementsByTagName("P");
alert(m.length);
}
</script>
<input type="button"
value="Get the number of p elements in this page"
onClick="function1();">
</body>
</html>