var onmouse = 'onmouseover = "overshow(this)" onmouseout = "overhiden(this)"';

<a name="rowid" href="#" class="addtnote" onclick="emptydata(2)"><i class="us-icon" ' + onmouse + '>' + sicon + '</i></a>

/**i标签html样式

   * thisi  i标签对象

*/

function overshow(thisi) {

    thisi.innerHTML = "";

}

/**i标签html样式

*thisi  i标签对象

*/

function overhiden(thisi) {

    thisi.innerHTML = "";

}