var Ver4 = parseInt(navigator.appVersion) >= 4
var Nav4 = ((navigator.appName == "Netscape") && Ver4)
var Opera = (navigator.appName == "Opera")
var IE4 = ((navigator.userAgent.indexOf("MSIE") != -1) && Ver4)

function flip(block, mode) {
    if (Nav4 || Opera) {
	document.getElementById(block).style.display =
	    (mode) ? 'block' : "none";
    }
    else if (IE4) {
  	document.all(block).style.display = (mode) ? '' : "none";
    }
    setTimeout("", 1500);
}