Check out the 'Campaign for Dark Skies' website....
CfDS - The Campaign for Dark Skies. An Anti Light Pollution Organisation.
Lots of advice there - in their 'Campaigning' section they give practical advice on what you can do about it, who to write to, etc.....
Also many links around the site, to other bits of info and advice.
Good luck - hope you get them stopped - streetlights are the bane of my life
