JavaScript动态添加和删除行

//添加按钮定义中的按钮
    function addBtnRow() {      
        var table = document.getElementById('btnList');
        var rownum = table.rows.length;
        var newrow = table.insertRow(rownum);
        var newcell = newrow.insertCell();
        newcell.innerHTML = "<input name='checkbox' type='radio' value='1'><input name='flags' type='hidden' value='1' ><input name='confIds' value='' type='hidden' />&nbsp;"+rownum;
        newcell = newrow.insertCell();
        newcell.innerHTML = "<input name='bvalue' value='' type='text' style='width:100%' >";
        newcell = newrow.insertCell();
        newcell.innerHTML = "<input name='bevent' value='' type='text' style='width:500px' ondblclick=openWin(this,'395','200'); >";
        newrow.cells[1].children[0].focus();
    }
   
    //删除按钮定义中的按钮
    function delBtnRow(){
         var table = document.getElementById("btnList");
         for(var i=1; i<table.rows.length; i++){
             if(table.rows[i].cells[0].children[0].checked){
                 if(table.rows[i].cells[0].children[2].value!=""){
                     document.forms[0].delConfId.value+=table.rows[i].cells[0].children[2].value+"@"