select detect impossible?

I have a select box (drop down list) on my html form. Is it possible to detect which one of the options is currently selected BEFORE the user presses the submit button using javascript??
e.g. The select box contains the following, choice1,choice2,choice3,choice4. each of the choices has a value associated with it:£5,£10,£15,£20. I also have a text box which I want to populate with the value according to which choice from the select box is currently selected. so, if the choose choice1, the text box is updated to display £5. I was thinking of catching the ONBLUR or ONCHANGE event of the select box to call a javascript function which populates the text box with: selectbox.option.selected, or even looping through each of the options to see which one had its selected property set, but it doesn't work. Is there any way to do this? (using ie.3 and netscape 3)
cheers for any suggestions.
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acsmithAsked:
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julio011597Commented:
I guess the problem is in your "selectbox.option.selected" which just checks for an option named "option" to be selected.

Here is a sample:

--//--
<HTML>
  <HEAD>
    <SCRIPT LANGUAGE="JavaScript1.1"><!--
      function selectChange(aSelect, aText) {
        aText.value = aSelect.options[aSelect.selectedIndex].text;
        return true;
      }
    // --></SCRIPT>
  </HEAD>
  <BODY>
    <FORM NAME="theForm">
      <INPUT TYPE="text" NAME="theText" VALUE="£5">
      <SELECT NAME="theSelect" onChange="JavaScript:selectChange(theSelect, theText);">
        <OPTION VALUE="0" SELECTED>£5
        <OPTION VALUE="1">$10
        <OPTION VALUE="2">&15
        <OPTION VALUE="3">&20
      </SELECT>
    </FORM>
  </BODY>
</HTML>
--//--

HTH, julio
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acsmithAuthor Commented:
thankyou!
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