<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form id="aaa">
<input type="button" onclick="alert(document.forms[0].id);" value="aaa form" />
</form>
<form id="bbb">
<input type="button" onclick="alert(document.forms[1].id);" value="bbb form" />
</form>
<form id="ccc">
<input type="button" onclick="alert(document.forms[2].id);" value="ccc form" />
</form><script type="text/JavaScript">
var frm = document.forms[0];
var frmElement = document.forms[0].elements[0];
document.write(frm.id + "<br />");
document.write(frmElement.type + "<br />");
/*
run:
aaa
button
*/
</script>
</body>
</html>