Altec,
как пример
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>
</title>
<style>
div {
border: 1px solid black;
height: 20px;
}
</style>
</head>
<body>
<div id="one" onmouseover="textChange(this)">Petrov</div>
<div id="two"> Text2</div>
<script>
function textChange(el ){
var html = el.textContent;
el.textContent = '';
return document.getElementById('two').textContent += html;
}
</script>
</body>
</html>