texture a cilinder

Hi guys, i want to make a table-lamp shade and I can’t get the texture to place itself the right way. When I add the image texture it appears rotated 90 degrees. Here’s an image of it.
http://farm3.static.flickr.com/2186/2277790022_4a22ed4f92.jpg?v=0
How can I rotate the texture so that the lines are horizontally instead of vertically ?-if I rotate it in an image editor it doesn’t help, it appears the same way.

When you loaded the image as a texture, in the Map Input panel is a button marked Rot90. Click that and see if it fixes your problem.

Hi, it didn’t help. It rotates the texture in the preview panel but on the model it doesn’t. I solved it by unwrappping the cilinder and editing an image in en external editor.