layer size please!!!!

I am new for Photoshop and I am facing a problem of adjusting layer size. I
created a new document and I used a move tool to bring a movie poster to my document. Unfortunately, the picture is too large and I press The CTRL and+ buttons to adjust the size of this movie layer. But the result is that all the document (the background) is going to be small. How can I adjust only the size of the movie layer?

(,") Thank you so much!! (",)

What you're seeing is that the original movie poster image has a higher pixel count in width and height than the new document you want to paste (or "MOVE" it, as you call it) it into.

You COULD Transform  the contents of just that one layer, but I'd suggest a better approach.

You may not want to hear this, depending on how much work you've tried to do so far, but....Start Over.

Go back to the original movie poster document.

Select All (CTRL + A)
Copy (CTRL + C)
Now, the contents of that original image are on the clipboard, at its original size, in pixels.

NEWBIE CONCEPT ALERT: In Photoshop, the ONLY measurement that matters is pixels. Learn to think of all physical measurements in terms of using pixels as your unit of measurement and you'll be way ahead of the game. Bookmark the following link and read it thoroughly. It's bloody brilliant: http://www.ScanTips.com

Create a New Document in Photoshop (CTRL + N). A dialog box will appear, and the size—in pixels—of what you just pasted will automatically be entered in this dialogue box. Pay attention to the "Mode" selection. I'd suggest changing it to "RGB" if it's not already. If you just hit the Enter key or click "OK" in the dialogue box will create a New Document the exact size of the original movie poster image. If you get a message about an embedded profile, just dismiss it.

Now, just Paste (CTRL + V) the contents of the clipboard into this new, blank document window and the poster image will appear, on its own layer above the default Background, centered in the new document.

You'll now be working with a document at the same resolution as the original movie poster image. If you want to reduce the physical size of it, wait until you've finished with it. You'll create a better final image this way.

And, just so you know: Holding the CTRL key, then tapping "+" or "-" key is how you zoom in and out of the image. This doesn't actually change the size of the image, just how you view it. These, and many more shortcuts can be found on your Quick Reference Card. This Quick Reference Card is also available in a PDF version on the Photoshop disk. Also, spend some time with the Help Files (in HTML format) and/or the Photoshop manual (also in PDF form) that ships with Photoshop, and which install with the application, by default.

The above answer is all good info and very true, however it does go on the assumption that your original document size that you brought your large movie poster into was incorrect. If your original size is your final size, and you just want to reduce the large movie poster to fit, use "Command-T" (Mac) or "Control-T" (PC) to transform the image and reduce its size to fit your document. Hold shift while dragging a corner to constrain your proportions and not distort the image horizontally or vertically.