var _ContractType = ["this_week", "next_week", "month", "quarter"][ContractType];
var _TradeType = ["buy", "sell"][OpType];
var _MarginLevel = [10, 20][MLevel];
var Interval = 300;

function GetTicker() {
    var ticker;
    while (!(ticker = exchange.GetTicker())) {
        Sleep(Interval);
    }
    return ticker;
}