Please help me fix my jpg and gif picture problems? Smart, savvy experts needed for this!

Can someone help me with this problem? My jpg and gif pics on my site look clear and peferct when using a regular internet connection using a computer and labtop. My friend has a wireless usb plug internet with a labtop. My friend went on my site using his labtop usb connection and the pics on my site where very blurry and not clear. I have search all over online and have not found a single solution to this problem. However, I did try changing the pics to a png format and all the pics were clear using my computer and his wireless usb connection labtop. But there is one big problem, with png the images download extremely slow. Can anyone be so kind in providing any solutions to fix this problem?

One more thing resizing and pixels adjustment do not work either. I willing to bet no one can give me the answer to this problem, but I will be very surprised if someone has the answer. Thanks for any help anyone can give.

Were the images saved in progressive? If so, they could be timing out loading the entire image before he sees the quality version. Try saving them as jpg, without progressive and see if it helps.

Thank you for trying to help me. The image was a regular 275 by 170 image. Its just a picture of a guy holding a notebook that i bought from getty images. I resized the image to 275 by 170 in paint, saved it as a jpg and put it on the site. Like I mentioned before it shows up perfectly clear using a labtop or desktop computer with a internet connection. The picture is very fuzzy and blurry on the website if you use a sprint usb wireless internet connection from a labtop. If I change the pic to a PNG, the picture shows perfectly on the regular internet connection and usb wireless internet connection. The problem with PNG, they take forever to download on both connections and labtops. Please help me with this problem somebody or tell me where I can post this question in another question on BHW. Any help greatly appreciated!

I wonder if its some sort of compression being done by the internet provider. Very wierd indeed though. PM me the image as a jpg and i can check it out and maybe try to compress it to a smaller PNG for ya.

Yes, I think your on the right track with the compression. However, png will not work for me. By the way, Im pretty sure this blurry fuzzy pic is appearing on smart phones as well. You might want to check your own site on a usb mobile device if you have access to one, to make sure your pics are displaying correctly. I can guarantee you lots of people are unaware of this situation and there losing potential customers due to this issue. Thank you very much for your help and if you find a solution, please let me know. Take care.

use multiple software for pics