Compress heigth of a picture

I want to make a background pic shorter, but not cut out anything. It is OK if the pic looks warped.  How can I compress the heigth of a picture? Thanks.
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You don't need Photoshop to reduce the height of a picture. Pretty much any free graphics application or file viewer can do that as well.

For example, IrfanView - a free file viewer for all graphics and multimedia formats:
Load the picture, go to Image > Change size of image
then choose the new dimensions, and if you only wish to change the height, not width, uncheck the 'Proportional' checkbox.
If you insist on using Photoshop, please check out this video:
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