Muzzle flash: Animating "blend" texture

I’m doing some special effects for a guy who requires some muzzle flashes for his movie. Heres the render on frame 2:
http://img387.imageshack.us/img387/1971/muzzleflash27eq.jpg

Heres the problem. On frame 3 I want the flash to be non existant. I can get the particle system and halo glow to turn off, but not the base mesh:
http://img387.imageshack.us/img387/3218/muzzleflash33pv.jpg

Its already at 0 Alpha. But the texture is making it visible. Heres the texture I’m using:
http://img369.imageshack.us/img369/3894/muzzleflashprob0cd.jpg

Is there anyway to animate the alpha level of “blend” texture in the IPO window?

Thanks in advance

try animating the ‘var’ or the ‘dvar’ over on the right.

I’m doing some special effects

How do you do special effects in blender?

Did you animate the alpha of both colours in the colourband?

As a last resort you can always move the object to an invisble layer (key on frame 2 on a visible layer, key on frame 3 on an invisible layer) or move it behind the camera, but those are of course ugly solutions which shouldn’t be necessary.