Change,Sales message goes here, with image

I know where to change: Sales message goes here. In header.php

My question is, instead of a message can a image be inserted there?

You could probably just insert a standard HTML call for an image:

<img src="images/my_image.jpg" alt="This is my image" title="The title of my image" />

You may need to embed HEIGHT and WIDTH parameters if you need to force the image into a given area... or just size your image to fit.

Thanks schoolboy for trying to help
Are you saying insert the code in:
define('HEADER_SALES_TEXT', '<img src="images/my_image.jpg" alt="This is my image" title="The title of my image" />');

If so, it does not seam to work.

Maybe it does work after all.
What shows up is the words in red
define('HEADER_SALES_TEXT', '<img src="images/my_image.jpg" alt="This is my image" title="The title of my image" />');

I am confused on what to insert in the red highlight words.

Found the problem
I did not have the correct path name to the image.

ALT and TITLE text should describe what the image is about. People who are blind cannot see the image, and they will probably have text reader software on their computers, where a "voice" will tell them what the image is. This software reads out the text contained in the ALT or TITLE tags.