how to remove the css class of an asp:textbox using jquery

Question

Hi all,

          i need to remove the css class of my textbox on focus event:

jquery:

function searchBoxfocus () {

               document.getElementById('<%= txtusername.ClientID%>').value = "";

               $('#txtusername').removeClass('text-label');

               $('#txtusername').addClass('glow');

           

            }

                    <asp:TextBox ID="txtusername" runat="server"  Text="USER NAME" onblur="searchBoxblur();"  onfocus="searchBoxfocus();" CssClass="text-label" AutoPostBack="true"></asp:TextBox>

          

pls help me out the class "text-label " is not removing.