Problem in Passing value through QueryString (AJAX)

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C#

ASP.NET

hi,

I have an grid view with three columns. In which two textboxes and one dropdownlist.
While i select an value from dropdown i need to fill the two textboxes with fetching values from Database(WITHOUT POSTBACK).

i used rowdatabound to initialize it....

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            TextBox txtpid = e.Row.FindControl("txt_pid") as TextBox;
            DropDownList txtpname = e.Row.FindControl("txt_pname") as DropDownList; //product name is dropdown
            TextBox txtpsize = e.Row.FindControl("txt_psize") as TextBox;
            txtpname.Attributes.Add("onChange", "javascript: return getEmpName('" + txtpid.ClientID + "','" + txtpname.ClientID + "','" + txtpsize.ClientID + "')");
        }
    }

My script to fetch data from DB through an Querystring

<script type="text/javascript" language="javascript">

function getEmpName(id,name,size) {

$.ajax({

type : "POST",


url : "Getempname.aspx?prod_name=" + $("#name").attr("value"),//Here am getting value of "name" is Undefined

success : function(reponseText) {
var s = reponseText.toString();
var temp = new Array();
temp = s.split(" ");
document.getElementById(id).value = temp[0];
document.getElementById(size).value = temp[1];
}

});

}

</script>

Please help me out...
Thanks in advance