Hello I have a header (header_bg.jpg) that I want to use for my header and its larger than the origional one. the origional one (760 X 110) is located in includes/templates/my_template_images. My header size is 794 X 294. What and where do I fix so I can see the whole image? also how do I get rid of the ZenCart logo that sits on top my header? Is it a setting in the admin pannel?

Thanks,
Chad