per esempio
codice:
function hover(e){
	if(!e) e=window.event;
	var source=(e.target)?e.target:e.srcElement;
	if(source.tagName=='LI'){
		document.title=source.innerHTML;
	}
}
<ul onmouseover="hover(event)">[*]a[*]b[*]c[*]d[*]e[/list]

ciao