I'm a regular user of waptrick and it offers games of different resolutions. Try downloading the game for your resolution. Or you can use a software called 'kemulator lite' to play java games on your computer. In this software, the resolution can be adjusted by pressing + or - buttons of number pad. It even supports full screen. But the problem is that, the game clarity reduces as resolution increases. Just google for 'kemulator lite' to know about it. Or use the given link http://goo.gl/e2D33

they r running in half of the screen bcoz.......they r not made for ur mobile.......try downloading games by ur handset number