Consider using this tag …
<img src=”http://upload.wikimedia.org/wikipedia/commons/3/36/2006-ca-turkey.jpg”>
You will notice that the image takes up the entire screen because it is such a large size.
Now try adding the WIDTH option to manually set the width of the displayed image like this …
<img width=300 src=”http://upload.wikimedia.org/wikipedia/commons/3/36/2006-ca-turkey.jpg”>
Did you notice what happened?