jQuery.extend({
    getUrlVars: function (href) {
        var vars = [], hash;
        var hashes = href.slice(href.indexOf('?') + 1).split('&');
        for (var i = 0; i < hashes.length; i++) {
            hash = hashes[i].split('=');
            vars.push(hash[0]);
            vars[hash[0]] = hash[1];
        }
        return vars;
    }
});

jQuery.fn.exists = function () { return jQuery(this).length > 0; };

(function (jQuery) {
    jQuery.fn.OnlyDigits = function () {
        return this.each(function () {
            jQuery(this).keydown(function (e) {
                var key = e.charCode || e.keyCode || 0;
                // allow backspace, tab, delete, arrows, numbers and keypad numbers ONLY
                return (
                key == 8 ||
                key == 9 ||
                key == 46 ||
                (key >= 37 && key <= 40) ||
                (key >= 48 && key <= 57) ||
                (key >= 96 && key <= 105));
            });
        });

    };
})(jQuery);