pic1 = new Image(100, 365);
pic1.src="images/sidebar4a.jpg";
pic2 = new Image(487, 365);
pic2.src="images/sidebar4b.jpg";

window.onerror = null;

ns4 = (document.layers) ? true:false
ie4 = (document.all) ? true:false 
ng5 = (document.getElementById) ? true:false 

function hidePic() {
if (ng5) document.getElementById('sidebar2').style.visibility = "hidden"
else if (ns4) document.sec1.visibility = "hide"
else if (ie4) sec1.style.visibility ="hidden"
}

function showPic() {
if (ng5) document.getElementById('sidebar2').style.visibility = "visible";
else if (ns4) document.layers["sidebar2"].visibility = "show";
else if (ie4) document.all["sidebar2"].style.visibility = "visible";
}