Find selected item from radiobutton list using javascript

ASP.NET renders a table and a bunch of other mark-up around the actual radio inputs  

 var list = document.getElementById("rdbdesc"); 

    var inputs = list.getElementsByTagName("input");  

    var selected;   

    for (var i = 0; i < inputs.length; i++)   

    {       

    if (inputs[i].checked) {  

    selected = inputs[i];      

    break;    

    }     

    }    

    if (selected) 

    {

        

    alert(selected.value);    

    

    }