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I need to drop down the voltage from 12v 1a to 6v 0.5a for a project but i dont know how to do this

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If I'm not mistaken (And I'm not, I'm looking at the datasheet right now), they make 6 volt regulators.

after searching on ebay i found this voltage regulator

http://cgi.ebay.com/2-PCS-79M06-7906-TO-220-Voltage-Regulator-6V-0-5A-/220587305978?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item335c072bfa
will it work?

That's a negative regulator - The '79' is the giveaway.
You need a 7806 if you're using a fixed one, like THIS.

thank you very much but what is the difirend about negetive and positive voltage regultors ?

sorry about that question but i am new at that thinks and i want to learn

No problems with answering questions from someone who wants to learn.

Voltages rails are measured with respect to a ground point - 0V - so any voltage higher than this point is positive, and any voltage below is negative.
Connect the black lead of your multimeter to the positive terminal of a 9V battery and call it ground. Put the red lead on the negative terminal and you're measuring -9V !

Some circuits (notably amplifiers) use both positive and negative rails, but if you're only using voltages one side of the ground reference it's conventional call these voltages positive, except in a few cases.

You could use a negative regulator, but you'd have to reverse your power supply in (+12V to the regulator 0V, 0V to the regulator input +V) and whatever you're connecting to the output.  Much simpler to keep it all 'positive'.

The LM317 is a simple and effective variable regulator - THIS link gives you the circuit you need.  Make the capacitors 47uF 16V(or higher).
You can put a variable resistor in place of R2 to get the voltage exact, or making R1 = 270R (red, violet,brown) and R2 = 1K (brown black red)will give you 5.88V - Near enough.
If the wires from the 12V supply are over 6 inches or so, put a 0.1uF capacitor across the input as well.
Don't worry about the current.  The thing you're connecting will take only what it needs.