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); 
}