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

function hideSec() {

if (ng5) document.getElementById('sec3').style.visibility = "hidden"
else if (ns4) document.sec3.visibility = "hide"
else if (ie4) sec3.style.visibility ="hidden"

if (ng5) document.getElementById('sec7').style.visibility = "hidden"
else if (ns4) document.sec7.visibility = "hide"
else if (ie4) sec7.style.visibility ="hidden"

if (ng5) document.getElementById('sec77').style.visibility = "hidden"
else if (ns4) document.sec77.visibility = "hide"
else if (ie4) sec77.style.visibility ="hidden"

if (ng5) document.getElementById('sec777').style.visibility = "hidden"
else if (ns4) document.sec777.visibility = "hide"
else if (ie4) sec777.style.visibility ="hidden"

if (ng5) document.getElementById('sec7777').style.visibility = "hidden"
else if (ns4) document.sec7777.visibility = "hide"
else if (ie4) sec7777.style.visibility ="hidden"

if (ng5) document.getElementById('sec77777').style.visibility = "hidden"
else if (ns4) document.sec77777.visibility = "hide"
else if (ie4) sec77777.style.visibility ="hidden"

if (ng5) document.getElementById('sec8').style.visibility = "hidden"
else if (ns4) document.sec8.visibility = "hide"
else if (ie4) sec8.style.visibility ="hidden"

if (ng5) document.getElementById('sec88').style.visibility = "hidden"
else if (ns4) document.sec88.visibility = "hide"
else if (ie4) sec88.style.visibility ="hidden"

if (ng5) document.getElementById('sec888').style.visibility = "hidden"
else if (ns4) document.sec888.visibility = "hide"
else if (ie4) sec888.style.visibility ="hidden"

if (ng5) document.getElementById('sec8888').style.visibility = "hidden"
else if (ns4) document.sec8888.visibility = "hide"
else if (ie4) sec8888.style.visibility ="hidden"

if (ng5) document.getElementById('sec88888').style.visibility = "hidden"
else if (ns4) document.sec88888.visibility = "hide"
else if (ie4) sec88888.style.visibility ="hidden"

}

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