function init() {
    var inputs = document.getElementsByTagName('input');
    for (var i = 0; i < inputs.length; i++) {
        inputs[i].setAttribute('rel', inputs[i].defaultValue);
        inputs[i].onfocus = function() {
            if (this.value == this.getAttribute('rel') && this.getAttribute('type') != 'submit' && this.getAttribute('type') != 'reset') {
                this.value = '';
            } else {
                return false;
            }
        }
        inputs[i].onblur = function() {
            if (this.value == '' && this.getAttribute('type') != 'submit' && this.getAttribute('type') != 'reset') {
                this.value = this.getAttribute('rel');
            } else {
                return false;
            }
        }
        inputs[i].ondblclick = function() {
            this.value = this.getAttribute('rel')
        }
    }
}

if (document.childNodes) {
    window.onload = init;
}