Zebronics headphone not working

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http://www.linuxquestions.org – i'm using jaunty jackalope ubuntu 9.04, my desktop speakers are working perfectly. NOw i wish to make my zebronics headphone work with it too. In windows my motherboard driver was from realtek. Please help me... i went to the volume control option and in that i see the following Device: HDA NVidia (alsa mixer) in the Switches tab the headphone is checked. I'm attaching the screenshots too here please look at theme and offer me help. Attached Images Screenshot.png (56.9 KB) Screenshot-1.png (54.3 KB) Screenshot-2.png (66.6 KB) (HowTos)