function inputDefault(elm, msg) {
	this.elm     = elm;
	this.msg     = msg;
	this.color   = '#999999';
	this.bgColor = '#F9FFF9';
}

inputDefault.prototype.set = function() {
	this._cleared    = false;
	this._defColor   = this.elm.style.color;
	this._defBGColor = this.elm.style.backgroundColor;

	this.elm.value        = this.msg;
	this.elm.style.color  = this.color;
	this.elm.style.backgroundColor = this.bgColor;

	var _this = this;
	addEvent( this.elm,      'focus',  function() { _this.clear();  } );
	addEvent( this.elm.form, 'submit', function() { _this.submit(); } );
}

inputDefault.prototype.clear = function() {
	if(this._cleared) return;

	this.elm.style.color            = this._defColor;
	this.elm.style.backgroundColor  = this._defBGColor;
	this.elm.value = '';
	this._cleared  = true;
}

inputDefault.prototype.submit = function() {
	if(this._cleared) return;

	var _this = this;
	this.elm.disabled = true;
	window.setTimeout(function() { _this.elm.disabled = false; }, 1);
}


function addEvent(elm, type, event) {
	if(elm.addEventListener) {
		elm.addEventListener(type, event, false);
	} else if(elm.attachEvent) {
		elm.attachEvent('on'+type, event);
	} else {
		elm['on'+type] = event;
	}
}