<script type="text/javascript">
function CheckQueryString(key) {
    var url = window.location.href;
    var keysValues = url.split(/[\?&]+/);
    for (i = 0; i < keysValues.length; i++) {
            var keyValue= keysValues[i].split("=");
            if (keyValue[0] == key) {
                alert(keyValue[1]);
        }
    }
}
</script>