text sizes and colours changed when uploaded to my browser. How can I fix this problem?

Could just be a caching issue. Do you know how to empty the cache in the web browser you are using?

I would also suggest using the Publish Entire Site option from the File menu.

If neither works, it could also be that your web host has cached certain files, but that is not likely.

Let me know how the above goes.

It also says that you are still using iWeb 08? Is this correct and if so, this will always give you problems. As iWeb is so old now and unsupported software, you are at least going to need iWeb 09 to stand a chance of changing your site.

If you can't fix it, then I would suggest that you ditch iWeb and use some other software that is current and is being actively developed such as EverWeb.

There is also RapidWeaver, Sandvox, Freeway Pro/Express, Flux V and WebAcappella 4. Take a look and try out any of these and also take a look at EverWeb. If iWeb is no longer working for you, the perhaps it is time to ditch it for something new and up-to-date.