[thesk8nmidget]

as what zboot said if it is factory put the key in the ignition and turn on if after market look for the speaker and unplug and hope it doesn thave a starter kill. if it does then you need to go under the dash and search for the starter wire and see if it has a break it in and wires going into it for the alarm and bypass it.

if the after market alarm ends up not lettign you start the car let me know and i'll look in my work database and tell you exactly what the starter wire will look like

EDIT:
WIRE________________COLOR_________LOCATION
Constant 12V+_______Red/White_______Ignition Switch Harness
Starter_____________Black/Yellow______Ignition Switch Harness
Ignition_______________Green_________Ignition Switch Harness


if worse come to worse and you cant figure it out and it wont start what you should do is turn the key on and then

locate the starter wire and constant and short them together for a breif moment and have the car startthat way.