<SPAN STYLE="color:red;background:white"
onMouseOver="style.background='blue'"
onMouseOut="style.background='white'">サンプル２</SPAN>

<SPAN STYLE="color:blue"
onMouseOver="style.color='yellow';style.background='red'"
onMouseOut="style.color='blue';style.background='none'">サンプル３</SPAN>