function findGetParameter(parameterName) {
    var result = null,
    tmp = [];
    location.search
        .substr(1)
        .split("&")
        .forEach(function (item) {
            tmp = item.split("=");
            if (tmp[0] === parameterName) result = decodeURIComponent(tmp[1]);
        });
    return result;
}
var loc = findGetParameter("loc");
if (0 == loc) loc = 1;