PLEASE!! someone help me..by mistake i deleted very important pictures on my sidekick slide and i really want them back ..can someone please help me!!

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i have deleted some photos by mistake from my mobile phone (n93i) and i have already taken another photos and the lost photo was written on memory card 1 gb

I have deleted some files and photos in my GSM memory card by mistake.now i need them back.can any one tel me how to recover them .is there is any program or system for that .