Dont do it!!!!!!!!!!!!!

If you upgrade you will kill any chance (at present of jailbreaking). 
I did mine last year without thinking and have regretted it ever since. stay with ios 5.1. Trust me there is no benefit at all in upgrading only losses

Is it possible to jailbreak an iPad 2 (A1395) after updating to iOS 6.0.1?
My web designer tells me that in a web page, the empty margins or padding should always be multiples of a standard. For example 6 px, 12px, 18px. This should produce nicely balanced lay-outs. I would like to learn a little bit more about it:

Should one really not violate this at all?

Should the standard be the same horizontally and vertically?
