悬停时在Firefox浏览器中定位锚标签的问题

Question

function func_showmenu(oevent,  stabid, irowindex) {
        var otable, orow, ocol;
        otable = eval(document.all.tabmenu);
        for(var ictr=otable.rows.length-1;ictr>=0;ictr--)
            otable.deleteRow(ictr);

                orow = otable.insertRow();
                ocol = orow.insertCell();
                ocol.innerHTML = "<a href=javascript:func_adddoc('moddoc',"+irowindex+")>Modify</a>";

        orow = otable.insertRow();
        ocol = orow.insertCell();
        ocol.innerHTML = "<a href=javascript:func_delrow('" + stabid + "'," + irowindex + ")>Delete</a>";
        otable.style.posTop = document.body.scrollTop + oevent.clientY;
        otable.style.posLeft = document.body.scrollLeft + oevent.clientX;
        otable.style.display = "";
}

当我悬停在我的行上时，修改/删除链接位于firefox浏览器页面的底部，与其他浏览器一样，它可以正常工作。请帮忙。