@Toofan
I never knew what your earlier post mean unless you said that(in the last post) that HSBC is not the worlds biggest bank. PLease note that the forbes link you mentioned points to 2006 rankings.
You can search on google for "The Banker", Euromoney, Brand Finance and even Forbes rankings and you will come to know that HSBC is currently the worlds biggest bank. Moreover the chart you posted is also outdated. I had a similar chart(updated for January 2009) at my office PC. You can also search for it on FT.com
According to market cap, biggest bank is HSBC followed by JPMorgan. If the above mentioned searches still do not satisfy you, then a little common sense would. Citibank has been 'nationalised'. Its share price dropped from $56 to $1.5(last night). Situation of RBS, BoA, UBSm ING, Fortis is in front of everyone. Nearly all have lost their networth due to heavy losses in the derivatives and subprime mortgage crises. On the other hand if you will search for news of HSBC you will come to know that they got out of all this mess in 2007 and predicted that all this crisis would happen therefore they had the minimal losses.