.net2005 radiosbuttonlist 控件控制文本显示！

var Radios = document.getElementsByName("rbtlistWarrant");
function showText(obj)...{
var lblAccreditText = document.getElementById("lblAccreditText");
                    if(obj.tagName == "INPUT")...{
                    var a = parseInt(obj.value);
                    alert(Radios.length);
                    alert(a);
                        switch (parseInt(obj.value))
                        ...{
                            case 0:
                             lblAccreditText.innerText = "0";
                             break ;
                            case 1:
                             lblAccreditText.innerText = "1";
                             break ;
                            case 2:
                             lblAccreditText.innerText = "2";
                             break ;
                            default:
                             alert("false"); 
                             break ;
                        }
                    }
                    
                    
                } 

function addEvent()...{
for(var i=0;i<Radios.length;i++)...{
    Radios[i].attachEvent("onclick",new Function("showText(Radios["+i+"])"));
    if(i == "0")
    ...{
        
    }
    }
}

 需要在body onload="addEvent()"