alright i posted in the Stereo and Electronics and never got an answer so...

im gonna light up my front and rear filler panel and i was gonna use these led's
http://cgi.ebay.com/100-5mm-White-LE...3A1%7C294%3A50

what resistors will i need and how should i set it up? they are gonna be connected to come on with the headlights (front) and brakes (rear)

 

Try this site for picking the resistors you will need. Ir asks basic info and helps set it up.

http://led.linear1.org/led.wiz

 

so will this set up work of should i do something different?
a series of 3 5mm 20k mcd leds connected to a 100 ohm resistor at 1/4 watt?