sailthru_horizon_track = function(params) {
    getCookie = function(name) {
    	var nameEQ = name + "=";
    	var ca = document.cookie.split(';');
    	for(var i=0;i < ca.length;i++) {
    		var c = ca[i];
    		while (c.charAt(0)==' ') c = c.substring(1,c.length);
    		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    	}
    	return null;
    };
    
    var hid = getCookie('sailthru_hid');
    if (!hid || !params.domain) {
        return;
    }
    
    var uri = 'http://' + params.domain + '/horizon/track?r=' + Math.random();
	if (params.tag instanceof Array) {
		uri += '&tag=' + encodeURIComponent(params.tag.join(','));
	} else {
		uri += '&tag=' + encodeURIComponent(params.tag);
	}
	
    document.write('<img src="'+uri+'" />');
};

sailthru_horizon_track(sailthru_horizon);