" class="popup">Радио
function handlePopupClick() {
window.open(this.href,'…','…');
return false;
}

window.onload = function() {
var lnks = document.getElementsByTagName('A')
for(var i = 0; i < lnks.length; i++)
if(/\bpopup\b/.test(lnks[i].className))
lnks[i].onclick = handlePopupClick;
}