Is there a way to replace the header with some image without altering the width?
 

I want to put an image in the header. how do you do this?
here i am attaching the example.

http://www.bayuka.com/example.jpg

Go to stylevars and choose header_background. The option you need is: Background Image. Hope it helps.

so are you saying that i can upload the image through admincp?

There you can see the name and path of the image that is used for the header background. You can either rename your image that you want to use the same as the default one and overwite it. Or you can change the image path to another custom image that you want to use.

Either way, the image upload has to be done with a Ftp Program or through File Manager at the CP of your host, providing it has one. Hope it helps.