using a dropdown selection as a submit button

I need a drop down box selection to act as a submit button, to post data to another webpage when it is selected- how will this work?
Thanks
-Ian

<select onchange="document.forms.formname.submit()">

should do it

I'm guessing you don't want the entire SELECT to submit - just one particular option; so...

<form onsubmit="alert('OK');return false">
<select onchange="if(this.selectedIndex==4)this.form.submit()">
<option selected="selected">choose</option>
<option>option 1</option>
<option>option 2</option>
<option>option 3</option>
<option>submit form</option>
</select>
</form>

Do it this way if you're not using a regular submit button anywhere. If you are, try this:

<form onsubmit="alert('OK');return false">
<select onchange="if(this.selectedIndex==4)sub.click()">
<option>choose</option>
<option>option 1</option>
<option>option 2</option>
<option>option 3</option>
<option>submit form</option>
</select>
<input name="sub" type="submit">
</form>

Notice the alert() - calling Form.submit() directly doesn't activate the onsubmit event handler, while simulating a submit button click does - important if you're using the handler for validation routines. Your choice. Set the .selectedIndex==number to the submitting option number (Javascript counts from zero).