// Roll over
function menuOver(obj) { obj.src = obj.src.replace("_off.gif", "_on.gif");}
function menuOut(obj) { obj.src = obj.src.replace("_on.gif", "_off.gif");}


// Show-Hide Layer 
function showLayer(tgtEl)    {    document.getElementById(tgtEl).style.display = "block"; }
function hideLayer(tgtEl)    {    document.getElementById(tgtEl).style.display = "none"; }