if (document.images)
{
     l_off = new Image();
        l_off.src = "images/firma-off.jpg";
        l_on = new Image();
        l_on.src = "images/firma-on.jpg"; 
     k_off = new Image();
        k_off.src = "images/oferta-off.jpg";
        k_on = new Image();
        k_on.src = "images/oferta-on.jpg";   
	m_off = new Image();
        m_off.src = "images/real-off.jpg";
        m_on = new Image();
        m_on.src = "images/real-on.jpg";  
   s_off = new Image();
        s_off.src = "images/kont-off.jpg";
        s_on = new Image();
        s_on.src = "images/kont-on.jpg";
}

function zapal(imgName,imgObjName)
{
        if (document.images)
        {
        document.images[imgName].src = eval(imgObjName + ".src");
        }
}