Dropdown Selected returning unexpected value on submit.

[Vic Hood]

Hi folks ,
Im trying to use a dropdown as part of the html form in the page im creating.The dropdown works in the following manner--
When I click or change the values in the dropdown the page reloads and the selected value is retained (using JavaScript), (expected behavior).However, when I submit the page using the submit button , I try to pass the value of the selected value(from the dropdown) through a script so that the value of the dropdown is passed correctly for DB operations, however the value is always set to -1.
and as result im not able to insert or update or perform any operations that occure after i press the submit button.
Im placing the code snippet from my jsp that I use for generating the dropdown and setting the selected value in a hidden field.
File:JSP

//javascript to submit the page when there is change in dropdown value
function changeHiddenInput() {
		var objDropDown=document.getElementById("d-down");
		var DTobjid=objDropDown.options[objDropDown.selectedIndex].value;	
		document.getElementById('selectedval').value=DTobjid;
		alert(DTobjid);
		document.getElementById('actcode').value="GETDOMLIST";
		document.getElementById('Main').submit();
		}

.....

// Generates the dropdown
	<TD>Domain Type <SELECT NAME="dropdown" SIZE="1" ID="d-down"
		ONCHANGE="changeHiddenInput()">
		<OPTION  VALUE="-1" label="--Select--" >
		<c:forEach items="${dao.dtList}" var="dt">
					<OPTION  VALUE="${dt.objid}" ><c:out value="${dt.description}"  /></OPTION>
		</c:forEach>
	</SELECT> <BR />
	</TD>
...
...
<INPUT TYPE="SUBMIT" VALUE="Submit" />
//script to fetch value from servlet to the selected domain
  <script>  
	
    var idd = ${setDtID};  
    document.getElementById("d-down").options.selectedIndex=idd;  

    </script>  	

Servlet , where the value from dropdown is obtained and used for further processing.

..
 Dtype=request.getParameter("selectedval");// the value of dropdown is obtained from the jsp
 ..
 if (!"".equalsIgnoreCase(Dtype) && null != Dtype)  {  
				            setDtID = String.valueOf(Dtype);  
				            System.out.println("setting Domain To"+setDtID);
				        } else {  
				            setDtID = "-1";  
				            System.out.println("Setting Domain to undefined value"+setDtID);
				        }  
	
					domainType_Oid=Integer.parseInt(setDtID);
					...
					

here the value of setDtID is set to -1 , and not the dropdown selection ,every time I perform a submit . Any clue as to why this could be happening? Thanks for your time . Any help would be appreciated.

[Vic Hood]

Solved it .. Forgot to set the value of the hidden field .. my bad :\