function sw_loginbox(inv_elem, state)
{
	if (state)
		inv_elem.style.backgroundImage = '';
	else if (!inv_elem.value.length) inv_elem.style.backgroundImage ='url(\'/images/login-'+ inv_elem.id +'.png\')';
}

if (window.addEventListener)
{
	window.addEventListener('load', function(){ sw_loginbox(document.getElementById('j_username'), 0); }, false);
	window.addEventListener('load', function(){ sw_loginbox(document.getElementById('j_password'), 0); }, false);
}
else if (window.attachEvent)
{
	window.attachEvent('onload', function(){ sw_loginbox(document.getElementById('j_username'), 0); });
	window.attachEvent('onload', function(){ sw_loginbox(document.getElementById('j_password'), 0); });
}