function initOverLabels() {
    if (!document.getElementById) return;

    var labels, id, field;

    // Set focus and blur handlers to hide and show 
    // LABELs with 'overlabel' class names.
    labels = document.getElementsByTagName('label');
    for (var i = 0; i < labels.length; i++) {

        if (labels[i].className == 'overlabel') {

            // Skip labels that do not have a named association
            // with another field.
            id = labels[i].htmlFor || labels[i].getAttribute('for');
            if (!id || !(field = document.getElementById(id))) {
                continue;
            }

            // Change the applied class to hover the label 
            // over the form field.
            labels[i].className = 'overlabel-apply';

            // Hide any fields having an initial value.
            if (field.value !== '') {
                hideLabel(field.getAttribute('id'), true);
            }

            // Set handlers to show and hide labels.
            field.onfocus = function() {
                hideLabel(this.getAttribute('id'), true);
            };
            field.onblur = function() {
                if (this.value === '') {
                    hideLabel(this.getAttribute('id'), false);
                }
            };

            // Handle clicks to LABEL elements (for Safari).
            labels[i].onclick = function() {
                var id, field;
                id = this.getAttribute('for');
                if (id && (field = document.getElementById(id))) {
                    field.focus();
                }
            };

        }
    }
};

function hideLabel(field_id, hide) {
    var field_for;
    var labels = document.getElementsByTagName('label');
    for (var i = 0; i < labels.length; i++) {
        field_for = labels[i].htmlFor || labels[i].getAttribute('for');
        if (field_for == field_id) {
            labels[i].style.textIndent = (hide) ? '-10000px' : '0px';
            return true;
        }
    }
}

window.onload = function() {
    setTimeout(initOverLabels, 5);
};