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);