drop down list inside form… how to trigger the action without button?

[arkinfes]

\[code\]<form id="form1" name="form1" method="post" action="foo.php"> sort by: <select> <option name="date">sort by date</option> <option name="name">sort by name</option> <option name="price">sort by price</option> </select></form>\[/code\]What I want here is that when I select an option the action in the form will be automatically executed? so in shortwhat I select will be send in foo.php thru $_POST. I dont want input button to make the action executed.Do I need Javascript to achieve this?Can you show me code to do this?if it needs javascript then how