Can somebody help? I want to make a glass material for a glass but I don´t know how to do it.
Any material can be transparent but you already have Gel Shader Material, and Jellybean material. If you open Material->Modifiers, you’ll see the transparency slider…This increases or decreases the transparency of the material, and like I say, any material can be made transparent by adjusting this slider.
Here’s a script to produce this image…
The script:
Transparency.txt 
oh, and here’s a glass goblet…
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Here are another couple of techniques you can use.
Here is an example using the clone brush tool:
http://www.pixolator.com/zbc-bin/ultimatebb.cgi?ubb=get_topic&f=1&t=000142
You could also check the ZBrush Picnic ZScript tutorial (included with the ZBrush distribution) for a method using 3D copy.
If using Stonecutter’s method above, remember to have “Flatten Layers” switched to “Off” under the render pallette.