an xterm that changes bkg transparency with mouse wheel?

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http://www.linuxquestions.org – I run my terminal program with a solid black (non-transparent) background. I'm not into distracting wallpapers or background photos. There are times when I need to monitor programs in windows behind the one I'm working in, but I can't see them. I usually have to tab through the different windows or move the xterm window with the mouse until I see the window I need, then go back. It sure would be nice to be able to use the mouse wheel to temporarily increase the transparency of my xterm window so that I could see what's behind it for a few seconds. Is there a terminal program out there tha (HowTos)