Well, the result of your asp should be a valid image tag, like:
<img src="yourdirectory/yourimagefilename.jpg">
or for xhtml the minimum would be
<img src="yourdirectory/yourimagefilename.jpg" alt="your alt text" />
Now create Response.write statements which produce this, like
Response.Write "<img src=""yourdirectory/yourimagefilename.jpg"" alt=""your alt text"" />"
(double the quotes or otherwise they wont be in the output)
And you can also use variables to product the content of the src and alt attributes
Response.Write "<img src="""
Response.Write thevarthatholdsyourfilename
Response.Write """ alt="""
Response.Write thevarthatholdsyouralttext
Response.Write """ />"
Or combine this to a single line
Response.Write "<img src=""" & thevarthatholdsyourfilename & """ alt=""" & thevarthatholdsyouralttext & """ />"