//Declare images to be used.
villaoff = new Image();
villaoff.src = "images/villa_on.gif"
villaon = new Image();
villaon.src = "images/villa_off.gif"
appartoff = new Image();
appartoff.src = "images/appart_on.gif"
apparton = new Image();
apparton.src = "images/appart_off.gif"
parcooff = new Image();
parcooff.src = "images/parco_on.gif"
parcoon = new Image();
parcoon.src = "images/parco_off.gif"
servizioff = new Image();
servizioff.src = "images/servizi_on.gif"
servizion = new Image();
servizion.src = "images/servizi_off.gif"
doveoff = new Image();
doveoff.src = "images/dove_on.gif"
doveon = new Image();
doveon.src = "images/dove_off.gif"
storiaoff = new Image();
storiaoff.src = "images/storia_on.gif"
storiaon = new Image();
storiaon.src = "images/storia_off.gif"
infooff = new Image();
infooff.src = "images/info_on.gif"
infoon = new Image();
infoon.src = "images/info_off.gif"
richiestaoff = new Image();
richiestaoff.src = "images/richiesta_on.gif"
richiestaon = new Image();
richiestaon.src = "images/richiesta_off.gif"

function chgImageOn(imgName,state)
{
    document[imgName].src = eval(imgName + "off.src");
}

function chgImageOff(imgName)
{
    document[imgName].src = eval(imgName + "on.src");
}