minecraft crashes after the mojang logo shows up

Put the summary of the bug you're having here

What I expected to happen was...:
the minecraft menu to show

What actually happened was...:
it crashed saying this

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Unexpected error

A full error report has been saved to /Users/david/Library/Application Support/minecraft/crash-reports/crash-2013-02-01_18.55.45-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 😞

Crash Report

--- BEGIN ERROR REPORT e7b46b5e --------
Full report at:
/Users/david/Library/Application Support/minecraft/crash-reports/crash-2013-02-01_18.55.45-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 2/1/13 6:55 PM

-- System Details --
Details:
	Minecraft Version: 13w05b
	Operating System: Mac OS X (x86_64) version 10.5.8
	Java Version: 1.6.0_26, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 496659080 bytes (473 MB) / 534708224 bytes (509 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	LWJGL: 2.4.2
	OpenGL: Intel GMA 950 OpenGL Engine GL version 1.2 APPLE-1.5.48, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.IllegalStateException: Function is not supported
	at org.lwjgl.BufferChecks.checkFunctionAddress(BufferChecks.java:64)
	at org.lwjgl.opengl.GL13.glActiveTexture(GL13.java:121)
	at bhm.a(SourceFile:479)
	at bfd.b(SourceFile:119)
	at net.minecraft.client.Minecraft.l(SourceFile:1058)
	at net.minecraft.client.Minecraft.K(SourceFile:574)
	at net.minecraft.client.Minecraft.run(SourceFile:526)
	at java.lang.Thread.run(Thread.java:680)
--- END ERROR REPORT c9cbae19 ----------




*Steps to Reproduce:*
1.change minecraft.jar for the snapshot download
2.open minecraft
3.log in