Batch resize images and maintain color palette

I need to resize 1000 3D image frames (gif? and bmp formats)? to half of the original size and maintain the? **original color palette** for all images.? I know few software that can resize the images in batch mode, but the problem is the color palette will be changed from original to a new color palette. If anyone knows how to do this, please help me.? ? Please tell me what software do I need to achieve this as quickly as possible.? The coder provided the real solution will be awarded the bid amount he/she placed. Thanks, ## Deliverables * * *This broadcast message was sent to all bidders on Thursday May 15, 2008 7:53:59 AM: Thank you for joining this bid. I found a software to do the job. Best wishes, Jerad