Help! Try to display an image...

I have a jsp file, which will display a image located on, say:
Y:\images\Folder1\aaa.jpg.
Now in my jsp file, I refer to this file with path like:
http://hostname/images/Folder1/aaa.jpg.
But I always got error message saying that this page can't be displayed. I typed the above http path directly in my browser, nothing came out. But if I type it's physical path, the image would come out. I guess I didn't construct my http path correctly. But how? Can anybody help me figure this out? Thanks!

The code is as follows:
<%
strsrc="http://hostname/images/myImages/aaa.jpg";
%>
<img name=image src="<%=strsrc%>" width=280 height=165 alt="Enlarge it?" onClick=enlarge();></img>
My web server is IIS. I am trying to access an image file on our web server from a jsp file located on my local machine: C:/myProject/photolog/photolog.jsp. The image file's physical path on the web server is c:/images/myImages/aaa.jpg.
The print out statement indecated that the path is: http://hostname/images/myImages/aaa.jpg. The hostname is the IP address of our web server. But this image wouldn't display. I am so comfused.
I can access any image file on the internet if I know its IP address and it container folder, right?
How to make sure an image file is accessiable throught web?
This is really urgent. My boss was just angry because of this problem. Thanks.

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Help! Try to display an image...

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