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

function getElementByClass(classname) {
	var inc = 0;
	var alltags = document.all ? document.all : document.getElementsByTagName("*");
	for (var 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("annonceur");
		setInterval("rotatecontent()", 6000);
	}
}