RadioButtonList selected item using javascript

[bharat kumar]

Hi
i have one RadioButtonList as below...

 

<asp:RadioButtonList id="rblType" runat="server"

 

 

style="z-index: 103; left: 465px; position: absolute; top: 120px;

 

 

width: 150px; height: 16px; vertical-align: middle;"

 

 

RepeatDirection="Horizontal" AutoPostBack="false"

 

onmousedown

 

="getCheckedRadio()"

 

 

 

 

 

 

 

OnSelectedIndexChanged="rblType_SelectedIndexChanged">

 

 

 

<asp:ListItem Text="St" Value="St" Selected="True"></asp:ListItem>

 

 

<asp:ListItem Text="TC" Value="TC"></asp:ListItem>

 

 

 

</asp:RadioButtonList>

now i want to change the text of textbox using the selected lsititem in radiobuttonlist using javascript.

 

function getCheckedRadio()
{

    var rblType= document.getElementsByName("ctl00_messagePanelsContent_contentPlaceHolder_fvAllotmentDetail_rblType");
//some loop here on rblType and then 
for(int i=0; i < rblType.length; i++ )
{
    if (rblType.item[i] == "checked")
      {       
            alert("You checked ");
        }
}
   
}

but the above javascript code is not working.
could anyone please help me to how to get the selected listitem using javascript.
thanks in advance...

waiting for reply.