function authenticate_form( id )
{
	var a = Math.floor(Math.random() * 0x10000);
	var b = Math.floor(Math.random() * 0x10000);
	var c = a ^ b ^ 0xf0f0;

	var auth = (a.toString(16) + ':' + b.toString(16) + ':' + c.toString(10)).toLowerCase();

	document.getElementById(id).value = auth;
}