jQuery: Get Query string value and insert the value in input field

<script type="text/javascript">
     jQuery(function () {
        var name = GetParameterValues('name');
        //var sku = GetParameterValues('sku');
        jQuery('#product_name').val(decodeURIComponent(name));
    });
    function GetParameterValues(param) {
        var url = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
        for (var i = 0; i < url.length; i++) {
            var urlparam = url&#91;i&#93;.split('=');
            if (urlparam&#91;0&#93; == param) {
                return urlparam&#91;1&#93;;
            }
        }
    }
</script>

Note: In above code i use a function named decodeURIComponent() this function give the query string data with spaces