function tzwa_track(interaction, extra) {
	//alert("track " + interaction);
	interaction  = str_replace("/"+interaction+"/", " ", "+");
	//alert("track " + interaction);
	_hbPageView(interaction,'/');
}

function str_replace(haystack, needle, replacement) {
    var temp = haystack.split(needle);
    return temp.join(replacement);
}