function IsDirty(oForm)
{
	var el, opt, hasDefault, i = 0, j;

	while (el = oForm.elements[i++]) 
	{
		switch (el.type) 
		{
		case 'text' :
		case 'textarea' :
		case 'hidden' :
			if (!/^\s*$/.test(el.value) && el.value != el.defaultValue) 
				return true;
			break;
		case 'checkbox' :
		case 'radio' :
			if (el.checked != el.defaultChecked) 
				return true;
			break;
		case 'select-one' :
		case 'select-multiple' :
			j = 0
			hasDefault = false;
			
			while (opt = el.options[j++])
				if (opt.defaultSelected) 
					hasDefault = true;

			j = hasDefault ? 0 : 1;

			while (opt = el.options[j++]) 
				if (opt.selected != opt.defaultSelected) 
					return true;
			break;
		}
	}

	return false;
}