Select option in HTML drop down list

Hi all, this has been puzzling me for a day. What I want to do is select other options in IE html drop down list. But somehow the other methods I read online doesn't work with my situation. I got either "Variable or Block Variable not set yet" or "Property or Method doesn't apply" errors. The following is the VBA code I have so far:

Sub IE_Auto()

Dim IE As Object
Dim IE_Object As Object
Dim IE_Element As Object
Dim IE_Select As Object
Dim IE_Value As Object
Dim i As Integer


Set IE = CreateObject("INTERNETEXPLORER.APPLICATION")
IE.navigate "my web address"
IE.Visible = True

Do While IE.Busy: DoEvents: Loop
Do While IE.readyState <> 4: DoEvents: Loop

Set IE_Object = IE.document.getElementsByTagName("input")

i = 0
Do While i < IE_Object.Length
    If IE_Object(i).Name = "username" Then
        IE_Object(i).Value = "my username"
    ElseIf IE_Object(i).Name = "password" Then
            IE_Object(i).Value = "my password"
    ElseIf IE_Object(i).Type = "image" Then
            IE_Object(i).Click
            Exit Do
    End If
    i = i + 1
Loop

Do While IE.Busy: DoEvents: Loop
Do While IE.readyState <> 4: DoEvents: Loop

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This is where I need your help 
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End Sub

and the following is html code of the web page:

HTML Code: 

I tried IE.document.getElementByName("dxr_report").Value = "file2" to choose the file2 but failed
I also tried IE.document.all.Item("dxr_report").Vaule = "file2", doesn't work either.

Any Idea? Please help! Thanks in advance