Browser Trouble

I found out that my blog does not always look the same depending upon which internet browser you are using.  I usually use Firefox and found out that things, mainly my pictures, don't look the same in Internet Explorer.  I am trying to figure out how to solve this problem so the blog looks good in all browsers.  This is a big learning process for me, especially since Matt (my husband, who is usually my go-to guy for computer problems) knows nothing about blogging.  So I am on my own.