Get form from form control (Button)
<html> <body> <script language="JavaScript"> function function1(form) { var elem = document.getElementById("myButton").form.id; alert(elem); return true; } </script> <form id="myF"> <input id="myButton" type="button" value="Get ID of this control's form" onClick="function1(this.form);"> </form> </body> </html>