I have an Adobe Photoshop CS3 extended and I was thinking of making an image transparent in this. What I am trying to do is take the floor plan that I found on the internet and make the ground floor transparent so I can put the upper floor on top of it and see where exactly the lines meet and from where to build on my program. What can I do to make an image on adobe Photoshop CS3 extended transparent? I would really appreciate your useful information regarding this. Please help. Thanks.