var server_ts = 1268211189;
var dt = new Date();
var client_ts = Math.round(dt.getTime() / 1000);
var diff = (client_ts - server_ts - (dt.getTimezoneOffset() * 60))/3600;

function get_diff( ) {
	return diff - 1;
}
function get_server() {
	return server_ts;
}
function tz_init() {
	if ( document.getElementById('timeDiff') ) {
		document.getElementById('timeDiff').value = get_diff();
	} 
	if ( document.getElementById('timeDiff2') ) {
		document.getElementById('timeDiff2').value = get_diff();
	}
}