<!-- BEGIN
function cenPU(theURL, Name, popW, popH, scroll) { // V 1.0
var winleft = (screen.width - popW) / 2;
var winUp = (screen.height - popH) / 2;
winProp = 'width='+popW+',height='+popH+',left='+winleft+',top='+winUp+',scrollbars='+scroll+',resizable'
Win = window.open(theURL, Name, winProp)
if (parseInt(navigator.appVersion) >= 4) { Win.window.focus(); }

}

function show_div(div_id) {
// hide all the divs
document.getElementById('div_1').style.display = 'none';
document.getElementById('div_2').style.display = 'none';
document.getElementById('div_3').style.display = 'none';
document.getElementById('div_4').style.display = 'none';
document.getElementById('div_5').style.display = 'none';

// show the requested div
document.getElementById(div_id).style.display = 'block';
} 
// END -->