Correct positioning of images within posts…

Hi All,

I have a problem with images staying where I place them within posts. They look great in the WYSIWYG editor, but when I publish or view the preview, they are all over the place.

I am running all macs here…. have tried this in firefox and safari but get the same result. I left WordPress a couple of years ago and moved to blogger because of this issue but I am convinced that there must be some fix.

Thanks in advance for any help you may be able to offer!