Can anyone help???!!!!

Im currently designing a JSP, which has some javascript embedded. What i am trying to do, is disable a button, if a user selects a particular row from the drop down list.

At the moment, within the select tag, the value of a variable (called Status) is queried to find out which option should have the <option selected> tag by it.
The problem is every time onchange gets run, i get an error saying that 'selectedindex' is undefined.
Any ideas?


Code:
<% String status = DLPULGA3Bean.getStatus(); %>

function checkIfAll()
{

	if (window.document.DLPULGA3form.statusValue.options[selectedIndex].value == "All")
		{
	window.document.DLPULGA3form.Find.disabled = true;
                }
	else
		{
		return false;
		}
}


<select name="statusValue" onChange="checkIfAll()">
			<% if (status.equals("Accepted")) {%>
			      <option selected>Accepted</option>
			      <option value ="Rejected">Rejected</option>
			      <option value ="Proposed"> Proposed</option>
			      <option value ="All">All</option>
			<% } else  if (status.equals("Rejected")) {%>
			      <option value ="Accepted">Accepted</option>
			      <option selected>Rejected</option>
			      <option value ="Proposed">Proposed</option>
			      <option value ="All">All</option>
			<% } else if (status.equals("Proposed")) {%>
			      <option value ="Accepted">Accepted</option>
			      <option value ="Rejected">Rejected</option>
			      <option selected>Proposed</option>
			      <option value ="All">All</option>
			<% } else { %>	
			      <option value ="Accepted">Accepted</option>
			      <option value ="Rejected">Rejected</option>
			      <option value ="Proposed">Proposed</option>
		              <option selected>All</option>					      
			<% }      %>
		</select>