Have you considered placing you picture as a background within a table.
If you want the website to be viewable by all browsers from 800*600 & upwards set the table width to no more than say 750 pixels.
To insert the image as a background file, I would right click in the table and select table properties, then click on the style button "buttom left" of the new dialog box which pops up, select the borders option from the list & then select the shading tab. The bottom section of this dialog will allow you to specify the image location & how it's displayed eg, centre with no repeat etc.....
Post back if you have problems