Notice how the source code for the table tag is on each line?
This is very important. It makes reading and checking for errors much easier.
Let's look at each line.
The first line is the div align=center tag. This centers the table containing the image. Use this code rather then the old "center" tags.
The next line we are defining the table with the table tag and specifying the width and height which, for now, is the same size of the picture.
The tr tag is used to define a row. We have no rows so we use an empty tr tag.
The td tag is the Table Data tag. Here is where we place the URL for our image along with the width and height of the image.
Now that we have our Table Data in place we must close the td tag with the /td tag.
Now close the Table Row tag with the /tr tag.
Then we close the Table with the /table tag.
And finally we close the div tag with the /div tag.
Notice how the table code flows?
We start with <table> then add the <tr> and the <td>
Then we close it in reverse order with </td> and </tr> and finally </table>