Ja tę rotację napisałem w ten sposób:
<body style="background:grey">
<span id="btn">CLICK</span>
<div id="string_to_rotate">Press to Continue</div>
<script>
var iterator = 1;
var string1 = 'Press to Continue';
var ins = document.getElementById('string_to_rotate');
function rotate_string() {
var size = string1.length-iterator;
ins.innerHTML = string1.substr(-iterator)+' '+string1.substr(0,size);
iterator++;
if(string1.length==iterator){
iterator=1;
}
}
document.getElementById('btn').addEventListener('click',rotate_string,false);
</script>
</body>