How to show to image when button is clicked using c# with touch event

Hi guys I am using ngui for the character selection screen.

I have completed upto this: http://share.pho.to/6U6vQ

Now i want to show a portrait of the character when a person touch the character icon.I was thinking of making touch event script

And i also want to the user to register a user name and then to check if the typed username by player is already there in database. If available the player can load to the game level else print message user name not available to the mobile screen device.

Create button should be greyed out if he does not type anything in the user name field.

Also any idea how to fit any image to any screen using ngui? Does ngui resize itself to fit any screen?I am also open to using default unity gui or daikon forge gui. I just want to achieve that.Please help.

I promise to teach the community who does know yet how to achieve this after i learn.Thanks

My reference picture:http://pho.to/6UNak

The included image are copyrights of respective parties.

Regards Gamingbir