Replace the font site title with a jpg & center opened pics

I am having trouble with the following:

1. replace the site title with an image

2. center the menu

3. change the color of the highlighter box (that comes up when you scroll over the menu) from light gray to black

3. change the alignment of all the pictures in galleries to center. (All of them are set to Alignment: Center, or Right, but they all stick to the left regardless. I have also tried changing the margins- I prefer Full Width Page for the thumbnails- but none of this has worked.)

4. remove the the date “2011” that wordpress adds to all the Titles under pictures in the galleries. (I know it’s possible to change the date for an entire gallery, but i want it gone all-together because in my Archive galleries i have work that spans several years)