sfFocus = function () {
    var sfEls = document.getElementsByTagName("input");
    for (var i = 0; i < sfEls.length; i++) {
        sfEls[i].onfocus = function () {
            this.className += " sffocus";
        }
        sfEls[i].onblur = function () {
            this.className = this.className.replace(new RegExp(" sffocus\\b"), "");
        }
    }
}
if (window.attachEvent) window.attachEvent("onload", sfFocus);