// This retrieves the tab number from the cookies. The return value is either undefined or "0", "1", "2".
var defaultLang = Cookies.get('language');

// So defaultLang is a string. In order to pass it to Spry, we need to convert it to a number. This can be done by multiplying it by 1.

(function() {
    if(defaultLang)
        return defaultLang * 1;
    else
        return 0;
})()

// This function returns the numeric value of defaultLang if it is set. If not, it returns 0. This function can be replaced by the following "short-hand expression". The top line is meant to explain what is happening.

//        if(x)     x * 1   else 0
defaultLang ? defaultLang * 1 : 0

var tp1 = Spry.Widget.TabbedPanels("streamtabs", { defaultTab: defaultLang ? defaultLang * 1 : 0 });