Pictures Installation

Hey guys,

I am building a website using WP 3.5.2 and I have just installed a few images in a couple of pages last night using Google Chrome as a browser. The pictures look great although I do have to edit them a little around the edges. Only one problem, I noticed today that when I am using Internet Explore as a browser, the images stay at the default size no matter how many times I try to edit it and it is takes up the whole page. Is this a common problem, is there a fix or do I need to I edit my images in PhotoShop ? I feel like I am missing something here. If someone could help me, I would appreciate it. Thanks.