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

function hideBignews() {
if (ng5) document.getElementById('bignews1').style.visibility = "hidden"
else if (ns4) document.bignews1.visibility = "hide"
else if (ie4) bignews1.style.visibility ="hidden"

if (ng5) document.getElementById('bignews2').style.visibility = "hidden"
else if (ns4) document.bignews2.visibility = "hide"
else if (ie4) bignews2.style.visibility ="hidden"

if (ng5) document.getElementById('bignews3').style.visibility = "hidden"
else if (ns4) document.bignews3.visibility = "hide"
else if (ie4) bignews3.style.visibility ="hidden"
}

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

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