jQuery.fn.numeric = function(decimal, callback) {
    decimal = decimal || "."; callback = typeof callback == "function" ? callback : function() { }; this.keypress(function(e) {
        var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0; if (key == 13 && this.nodeName.toLowerCase() == "input")
        { return true; }
        else if (key == 13)
        { return false; }
        var allow = false; if ((e.ctrlKey && key == 97) || (e.ctrlKey && key == 65)) return true; if ((e.ctrlKey && key == 120) || (e.ctrlKey && key == 88)) return true; if ((e.ctrlKey && key == 99) || (e.ctrlKey && key == 67)) return true; if ((e.ctrlKey && key == 122) || (e.ctrlKey && key == 90)) return true; if ((e.ctrlKey && key == 118) || (e.ctrlKey && key == 86) || (e.shiftKey && key == 45)) return true; if (key < 48 || key > 57) {
            if (key == 45 && this.value.length == 0) return true; if (key == decimal.charCodeAt(0) && this.value.indexOf(decimal) != -1)
            { allow = false; }
            if (key != 8 && key != 9 && key != 13 && key != 35 && key != 36 && key != 37 && key != 39 && key != 46)
            { allow = false; }
            else {
                if (typeof e.charCode != "undefined") {
                    if (e.keyCode == e.which && e.which != 0)
                    { allow = true; }
                    else if (e.keyCode != 0 && e.charCode == 0 && e.which == 0)
                    { allow = true; }
                }
            }
            if (key == decimal.charCodeAt(0) && this.value.indexOf(decimal) == -1)
            { allow = true; }
        }
        else
        { allow = true; }
        return allow;
    }).blur(function() {
        var val = jQuery(this).val(); if (val != "") {
            var re = new RegExp("^\\d+$|\\d*" + decimal + "\\d+"); if (!re.exec(val))
            { callback.apply(this); }
        }
    })
    return this;
}