function hidePic() {
if (ng5) document.getElementById('pic1').style.visibility = "hidden"
else if (ns4) document.pic1.visibility = "hide"
else if (ie4) pic1.style.visibility ="hidden"

if (ng5) document.getElementById('pic2').style.visibility = "hidden"
else if (ns4) document.pic2.visibility = "hide"
else if (ie4) pic2.style.visibility ="hidden"

if (ng5) document.getElementById('pic3').style.visibility = "hidden"
else if (ns4) document.pic3.visibility = "hide"
else if (ie4) pic3.style.visibility ="hidden"

if (ng5) document.getElementById('pic4').style.visibility = "hidden"
else if (ns4) document.pic4.visibility = "hide"
else if (ie4) pic4.style.visibility ="hidden"

if (ng5) document.getElementById('pic5').style.visibility = "hidden"
else if (ns4) document.pic5.visibility = "hide"
else if (ie4) pic5.style.visibility ="hidden"

if (ng5) document.getElementById('pic6').style.visibility = "hidden"
else if (ns4) document.pic6.visibility = "hide"
else if (ie4) pic6.style.visibility ="hidden"
}

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