well thanks exacly what i also wanted to do. most laptop inverters have 4 to 6 wires. gnd vcc 12v, enable, 0-3.5v for brightness controls.
here is some info here. and 95% of laptops use this configuration. so just get a voltmeter and start pokeing around. most of the time. the 12 pin is connected to a fuse in the board.
do not connect 12v to ground and ground to 12v(flip the cables) because it will probably ruin the inverter.
i would like to hear how it goes. i was making a light box with some ccfl tubes and a broken lcd lol.
http://www.lcdparts.net/UInverter.aspx