Add an option to select
<html> <body> <script language="JavaScript"> function function1() { var newOption = document.createElement('<option value="TOYOTA">'); document.all.mySelect.options.add(newOption); newOption.innerText = "Toyota"; } function function2() { document.all.mySelect.options.remove(0); } </script> <select id="mySelect"> <option value="A">A</option> <option value="B">B</option> <option value="C">C</option> </select> <input type="button" value="Add" onclick="function1();"> <input type="button" value="Remove" onclick="function2();"> </body> </html>