How to sychronize second monitor to be an extension of my 20" iMac

I have a second 19" Flat Wide Screen Monitor next to my 20" iMac. However, there are a couple of things that I don't know how to adjust.
1- The Wallpaper on both monitors are different how can I have the same Wallpaper or the same rotation of images to be the same on both monitors
2- I can't sychronoze both screen to display the same size for the browser or whatever I'm viewing. I have gone to Display and to Arrangement and moved the second monitor up or down but somehow the page on the second screen RT side it's about 3" longer. How can I make the Browser or page extend to the second screen appearing exactly or close to the same size as on the iMac

What Al said is correct. With two different size monitors you will not be able to have things "line" up. Your primary display, in this case the iMac, is what your settings are based on.
Lets say the bottom of both of your monitors are at the exact same height and the top of your iMac is 2 inches taller than your secondary display, if you were to slide a window that was aligned at the top of your monitor over to your secondary display, the top of that window would be cut off by that 2 inches. As far as your computer is concerned both monitors are at the same height.
Another example is to draw an imaginary line from the top of your iMac display across to your secondary display, Your window that you slid over in the previous example would be inline with that "imaginary" line.
Like Al said in his post, if you want things to line up you need two monitors that are the same size.
I use my secondary monitor for (a 20" Samsung) to house all of my tool pallets when working in graphics programs. Or if I'm working on multiple things at once "multi tasking" I'll move some of the windows over to the other display for reference.
I hope I didn't confuse you even more, it's a bit difficult to explain without visuals.
Brian

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