how i can add image in my toolbar

[jyoti]

hi all
i have some icons in toolbar size of 48x48 each having some actions and now i want to add image on remaining space ....when i add image as icon in remaining space but it looks very small....i want to add proper image in toolbar on click of image it may open another URL....
means when i click on image it open another dialog which have some information....

i had add icons through designer...so is there any need of programming to add image or what...
plz tell be about how to add image in toolbar (image navigation)...

my form is attached below