function param(key) {
    var params = {}
    window.location.search.substr(1).split("&").forEach(function(it) {
        var slots = it.split("=")
        params[slots[0]] = slots[1] == "true"? true : 
            slots[1] == "false"? false :
            slots[1]
    })
    param = function(key) {
        return params[key]
    }
    return param(key)
}