if (document.all || document.getElementById){ //if IE4 or NS6+ 
document.write('<style type="text/css">\n'); 
document.write('.dyncontent{display: none;}\n'); 
document.write('</style>'); 
} 

var curcontentindex=0; 
var messages=new Array(); 

function getElementByClass(classname){ 
var inc=0; 
var alltags=document.all? document.all : document.getElementsByTagName("*"); 
for (i=0; i<alltags.length; i++){ 
if (alltags[i].className==classname) 
messages[inc++]=alltags[i]; 
} 
} 

function rotatecontent(){ 
//get current message index (to show it): 
curcontentindex=(curcontentindex<messages.length-1)? curcontentindex+1 : 0; 
//get previous message index (to hide it): 
prevcontentindex=(curcontentindex==0)? messages.length-1 : curcontentindex-1; 
messages[prevcontentindex].style.display="none"; //hide previous message 
messages[curcontentindex].style.display="block"; //show current message 
} 

window.onload=function(){ 
if (document.all || document.getElementById){ 
getElementByClass("dyncontent"); 
setInterval("rotatecontent()", 5000); 
} 
}