Hi hmscskaren,
1. The icon and "Contoso" in my home page actually are in same image.(An image with icon and text)
2. Could you let me know how did you customize the image? because you said you're not trying to put an image in the navbar,
however, you also mentioned that you had put image in header portion, as far as I know, navbar could be regarded as to header;
3. "the same image appears in the header portion of each page":
because these pages are sharing a same public header, so the possible customization method would be:
the logo element had a href "/Logo", if you re-uploaded a new note image file, then the logo image will also get updated.
In a word, due to Home, Support..etc pages have same header, so the issue comes out.
4. I thought that changing the logo dynamicly by javascript would be an easy option,
because you still need to create multiple web files for different pages, (e.g: toolbox.png -> Support, editor.png -> Knowledgebase etc)
you might had to create multiple headers for different pages without code,
while everythting could be done in a same script tag if we work with javascript.
Please kindly point out if I didn't understand you real requirement properly, I'll still try my best to find a easy way for you scenario. Thanks.
Regards,
Clofly