Saving same png file gives me image with 10x smaller size

Hi.
I would appriciate if someone explained me what I'm doing wrong.
I have a png image, of 256x128 size. It has 8bits per pixel for color. Now this image's size is 97kB. I open it in photoshop, I save it as different png file, and then... this image is 7kB of size.
Can someone tell me what's wrong, or what I'm doing wrong?
Lucas

Ok guys, thanks a lot for patience. Below is the main cause why I started this topic, but I still can't figure it out. I thought the loss of size is the cause, but you say it's not :/
I'm not that skilled as you guys, so that's the primary reason why I'm here. I will be really gratefull if someone could give me a hint here, or some small help.
To cut to the chase, I'm trying to use a program that creates graphics for older games. This program edits particular files, that have different resolutions and different number of bits per pixel. The problem I have however is the transparency and color palette, as I never had dealings with that. The problem is, that someone created before a pictures that are very smooth, and this seems to be the cause of very smart using of transparency levels, for different colors in the palete. However, I have no idea how to achieve the same effect, I tried many things, but still can't figure this out. I will try to ilustrate the problem below.
Below is a screenshot from this application
[img]http://img21.imageshack.us/img21/5396/41135434.png[/img]
On the right is the picture that is the root of my question here. It has to be in the format with palette of collors in amount of 16, although I have no idea where it stores the alpha channel information, as there are 4 bits for color per pixel. Well anyways, you can see on the right top corner the palette. It basicaly has only the shades of gray in this case. I can switch now to the alpha channel mask, and this is what I get:
[img]http://img29.imageshack.us/img29/4089/69176653.png/img]
You can see that each of the colors in the palette has different alpha values. Now what I tried is, I exported the image, I opened it with photoshop, saved it, imported it in the program, and guess what I found in the alpha channel mask:
[img]http://img821.imageshack.us/img821/7104/51957014.png[/img]
All the information of the alpha channel for each color is gone!
Here are the examples with more colors(256):
[img]http://img853.imageshack.us/img853/2108/84834785.png[/img]
The alpha channel mask
[img]http://img718.imageshack.us/img718/4944/25526459.png[/img]
And now, I do the same as before, export it, save it in photoshop, and guess what, all the info is gone again:
[img]http://img577.imageshack.us/img577/8991/50003321.png[/img]
Now loosing this information is not a problem, as I will be inputting different pictures, but my question is, how I can achieve the same effect in photoshop for my images that I will try to import. I would love to have as smooth edges as they are seen on those examples above.

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