How to create invisible gif image?

using photoshop?
the easiest one only please.

file>new>choose transparent instead of background color

safe as GIF

my image is already made. i need to make it transparent.

can't u just right click on any picture and go to open with Adobe Photoshop or just import the image and i have no idea how to do the rest.

With the wand tool (hit w) select the part u want transparent. Then go Help > Export Transparent Image!

Easy! Easy! Easy! :D

i do it the traditional and more proven way.
pick a color that you are SURE won't be on a pixel in your image (i use light magenta). fill in the area of your image you want to be transparent with that color. then choose Image->Mode->Indexed. Click OK in the next dialog. Then go File->Export->GIF and click the "transparent" color in the palette below. if your image is anti-aliased, click ALL iterations of the color. then click OK and save.