function initFade() { 
// used to flash the strobes periodically
 setTimeout('doFade(true)',2000); 
// fixes for quirky browser rendering
 document.getElementById("header").style.marginTop = -(document.getElementById("header").offsetTop) + "px";
}
function doFade(bTF) {
 doIt('s1', 'sa', bTF);
 doIt('s2', 'sb', bTF);
 doIt('s3', 'sc', bTF);
 doIt('s4', 'sd', bTF);
 setTimeout('doFade(' + !bTF + ')', bTF ? 60000 : 2000);
}
function doIt(ea, eb, bTF) {
 document.getElementById(ea).style.display = bTF ? "none" : "inline";
 document.getElementById(eb).style.display = !bTF ? "none" : "inline";
}
 
// popups
function popURL(url, trg, h, w) {
 var att = "location=0,menubar=0,scrollbars=0,titlebar=0,toolbar=0,directories=0,resizable=0,status=0,resizable=0,height=" + h +",width=" + w;
 window.open(url, trg, att); 
}