function suckerfish(type, tag, parentId) {
    if (window.attachEvent) {
        window.attachEvent("onload", function() {
            var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);
            type(sfEls);
        });
    }
}
sfHover = function(sfEls) {
    for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmouseover=function() {
            this.className+=" sfhover";
        }
        sfEls[i].onmouseout=function() {
            this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
        }
    }
}
sfFocus = function(sfEls) {
    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"), "");
        }
    }
}
sfActive = function(sfEls) {
    for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmousedown=function() {
            this.className+=" sfactive";
        }
        sfEls[i].onmouseup=function() {
            this.className=this.className.replace(new RegExp(" sfactive\\b"), "");
        }
    }
}
sfTarget = function(sfEls) {
    var aEls = document.getElementsByTagName("A");
    document.lastTarget = null;
    for (var i=0; i<sfEls.length; i++) {
        if (sfEls[i].id) {
            if (location.hash==("#" + sfEls[i].id)) {
                sfEls[i].className+=" sftarget";
                document.lastTarget=sfEls[i];
            }
            for (var j=0; j<aEls.length; j++) {
                if (aEls[j].hash==("#" + sfEls[i].id)) aEls[j].targetEl = sfEls[i];
                aEls[j].onclick = function() {
                    if (document.lastTarget) docu.lastTarget.className = document.lastTarget.className.replace(new RegExp(" sftarget\\b"), "");
                    if (this.targetEl) this.targetEl.className+=" sftarget";
                    document.lastTarget=this.targetEl;
                    return true;
                }
            }
        }
    }
}

// Usage
// suckerfish(sfHover, "LI", "nav");
// suckerfish(sfFocus, "INPUT");