passing a variable to input type

[petevick]

I want to pass the value of a drop down list to a hidden Input in my html code, something like...

<input type="hidden" name="quantity" value= list.value>

Any one got any ideas on how this might be achieved. I've had several goes, but all have failed

[petevick]

so here it is....

bit of java first...

<script language="JavaScript"> 
function setValue()
{
var form=window.document.steel;
var select=form.steel_seats;
form.quantity.value=select[select.selectedIndex].value;
}
</script>

then the form itself....

      <form target="paypal" name="steel" action="https://www.paypal.com/cgi-bin/webscr" method="post" onSubmit="setValue()">
        <p align="left"><select size="1" name="steel_seats">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option>4</option>
        <option value="5">5</option>
        </select>
        <input type="image" src="https://www.paypal.com/en_GB/i/btn/x-click-but22.gif" border="0" name="I4" alt="Make payments with PayPal - it's fast, free and secure!" width="94" height="21"></p>
        <input type="hidden" name="add" value="1">
        <input type="hidden" name="cmd" value="_cart">
        <input type="hidden" name="quantity">
        <input type="hidden" name="lc" value="GB">
      </form>

the hidden field name "quantity" gets its value when the user clicks to submit, the jave function is run, and the field gets its value.

Thanks to chessbott over at Tek-Tips forums for the answer.