Mms??????????? Help me if you can

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I recently bought an original Motorola Droid from a buddy of mine and I feel I have everything pretty well figured out.... The one thing I am unsure about is why it converts all pictures sent via text to MMS videos. Is there a way to send a picture to someone elses phone and have it just be the picture and not a short video of the picture. I send images to my dads phone with no text included in it and it turns it into a short video of the image.

Sorry if this has already been asked.... I'm new to the Droid and the forum

Thanks in advance