function blinker() {
	for(k=0; k<document.getElementsByTagName("span").length; k++) {
		if(document.getElementsByTagName("span")[k].style.visibility != "hidden") {
			if(document.getElementsByTagName("span")[k].className.substr(0, 5) == "blink")
				document.getElementsByTagName("span")[k].style.visibility = "hidden";
			} else {
			    if(document.getElementsByTagName("span")[k].className.substr(0, 5) == "blink")
				document.getElementsByTagName("span")[k].style.visibility = "visible";
			}
		}
		var zeit = 750;
		window.setTimeout("blinker()", zeit);
	}