Getting pictures sized correctly for the web can be a struggle without photo editing software.
On the web, dimensions are measured in pixels. Therefore, we found a pixel ruler for you to download. You can use this tool to measure the space on your web site, and then adjust your pictures based on what you measured using the pixel ruler.
It's a safe, free download, and it'll just sit on your desktop. It'll help you greatly as you're trying to correctly size photos for your web site.