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

function img_inact(imgName)
{
       
        imgOff = eval(imgName + "off.src");
        document [imgName].src = imgOff;
        
}

circ1on = new Image( );
circ1on.src = "images/seatlighton.gif";
circ1off = new Image( );
circ1off.src = "images/seatlightoff.gif";
circ2on = new Image( );
circ2on.src = "images/ticketon.gif";
circ2off = new Image( );
circ2off.src = "images/ticketoff.gif";