create custom button asp.net

Hi there,

I am working on a project at the minute and i have created a button
using the following code.

<asp:button id="Button1" onclick="upload" runat="server" Width="119px"
text="Upload"></asp:button>

this button calls and runs some code ie. sub upload - see below

Public Sub upload(ByVal s As Object, ByVal e As EventArgs)

code here .......

i have created my own button in fireworks and want to insert it in my
code an call this function but it does not work - code below

<INPUT id="btn_EditImage" type="image" src="Buttons/EditImage.gif"
onclick="upload" runat="server"></TD>

Can anyone please tell me what the problem is and how can i get round
this issue. i do not really understand the (ByVal s As Object, ByVal e
As EventArgs) in my sub routine can this be removed ???
.

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