table动态添加，删除行，列

 function createTr()  
{  
    var tab = document.getElementById("tab");  
    var tr = tab.insertRow();//create tr  
    //create td  
    var td1 = tr.insertCell(0);  
    td1.style.textAlign = "center";  
    td1.innerHTML = '<img src="../imgs/bt_minus.gif" width="14" height="10" border="0" onclick="DelRow();" alt="删除"/>';  
    var td2 = tr.insertCell(1);  
    td2.style.textAlign = "center";  
    td2.innerHTML = '<input type="text" name="tel" size="13" value=""/>';  
    var td3 = tr.insertCell(2);  
    td3.style.textAlign = "center";  
    td3.innerHTML = '<input type="text" name="code1" size="13"/>';  
    var td4 = tr.insertCell(3);  
    td4.style.textAlign = "center";  
    td4.innerHTML = '<input type="text" name="address" size="48"/>';  
    var td5 = tr.insertCell(4);  
    td5.style.textAlign = "center";  
    td5.innerHTML = '<input type="text" name="code2" size="13"/>';  
                    
} 
function DelRow()  
{  
    var iIndex = window.event.srcElement.parentElement.parentElement.rowIndex;  
    var tab = document.getElementById("tab");  
    if(iIndex==-99999)  
      alert("系统提示：没有选中行号!");  
    else{  
         tab.deleteRow(iIndex);  
    }  
       
}