动态添加html单元格同时添加事件

以onMouseOver为例

function add() {
    tr=Grid1.insertRow();
    td=tr.insertCell();
    td.innerText="a";
    td=tr.insertCell();
    td.innerText="b";
    tr.attachEvent('onmouseover',c1);
    tr.attachEvent('onmouseout',c2);
    //document.all.Grid1.rows[0].onmouseover=c();
}

function c1() { 
    var t=event.srcElement.parentElement; 
    t.style.backgroundColor="#dedede"; 
}

function c2() { 
    var t=event.srcElement.parentElement; 
    t.style.backgroundColor=""; 
}