okay, don't bug me about how he changes size, or how there may not be enough frames, I just want to ask if that looks like how somebody would jump?
[flash]http://www.swfupload.com/files/80550Fbf_trying_to_jump_far.swf[/flash]
The beginning was a good start, however when he goes up to jump, it doesn't look anything like a jump should look like. Try recording yourself (or looking at a video of someone else) jumping in place, and study the movement. That will usually do the trick.
Okay, the first of what should become many articles of good advice.
Nice start! Your character seems to glide through the air though at a constant speed, as if there is low gravity... Ease him in and out of the jump, if you know what i mean; you don't need as many frames around the point when he just leaves the floor and when he's just about to land - you need to cover greater distance in less frames to increase speed when taking off/landing. Bah, it's hard to explain, here's a bouncing ball diagram that should help you understand what I mean:
(https://clockcrew.net/talk/proxy.php?request=http%3A%2F%2Ffarm3.static.flickr.com%2F2074%2F2389444869_d0f16fd9a6.jpg&hash=2e6746cc2ff22e84efdc6d4708ffa486433ce3d7)
sweet, I see.
okay nite guys.