Can't merge channels

I am new to Photoshop CS5.  I am trying to merge 3 8-bit grayscale images of exactly the same size.  I'm trying to follow the instructions below, but the "Merge Channels" option remains grayed out.  I have no idea what to try next, i have struggled with this for close to 3 hours now.  thank you
from http://help.adobe.com/en_US/photoshop/cs/using/WSEB1D7D58-2D47-4bc5-86AB-0767C42F7854a.htm l
Open the grayscale images containing the channels you want to merge, and make one of the images active.You must have more than one image open for the Merge Channels option to be available.
Choose Merge Channels from the Channels panel menu.
For Mode, choose the color mode you want to create. The number of channels appropriate for the mode appears in the Channels text box.
If necessary, enter a number in the Channels text box. If you enter a number that is incompatible with the selected mode, Multichannel mode is automatically selected. This creates a multichannel image with two or more channels.
Click OK.
For each channel, make sure the image you want is open. If you change your mind about the image type, click Mode to return to the Merge Channels dialog box.
If you are merging channels into a multichannel image, click Next, and select the remaining channels.
Note: All channels of a multichannel image are alpha channels or spot channels.
When you have finished selecting channels, click OK. The selected channels are merged into a new image of the specified type, and the original images are closed without any changes. The new image appears in an untitled window.

Thank you all.  The problem (which your suggestions helped me to identify) is that the images had been saved as indexed color, instead of grayscale, because I had the "show saturated pixels" option on in the acquisition software.  Converting them to grayscale solved the problem.  thanks again

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