xplOn=new Image;xplOn.src = "gfx/big-pl.gif";xplOff=new Image;xplOff.src = "gfx/big-pl0.gif";
xenOn=new Image;xenOn.src = "gfx/big-en.gif";xenOff=new Image;xenOff.src = "gfx/big-en0.gif";
splOn=new Image;splOn.src = "gfx/big-pl.gif";splOff=new Image;splOff.src = "gfx/big-pl0.gif";
senOn=new Image;senOn.src = "gfx/big-en.gif";senOff=new Image;senOff.src = "gfx/big-en0.gif";

function switchOn(imgName){imgOn = eval(imgName + "On.src");document.getElementById(imgName).src=imgOn;}
function switchOff(imgName){imgOff = eval(imgName + "Off.src");document.getElementById(imgName).src = imgOff;}