Get url parameters with javascript

getURLParams.js

// get url parameters with javascript (e.g.: sample.html?udid=123&device=iphone)
function getURLParams() {
    var params= new Object();
    var query = window.location.search.substring(1);
    var pairs = query.split('&');
    for (var i=0; i<pairs.length; i++) {
        var pos = pairs[i].indexOf('=');
        if (pos > 0) {
            var key = pairs[i].substring(0,pos);
            var val = pairs[i].substring(pos+1);
            params[key] = val;
        }
    }
    return params;
}