Call JavaScript function on <a> for show hide textbox

Question

Hi All,

I want to show hide the textbox on click of <a> anchor tag, using javascript.

<asp:TextBox ID="txtMobile" CssClass="form-control" placeholder="Your Mobile Number" runat="server" required="required" Style="display: none"></asp:TextBox>
                        <asp:TextBox ID="txtEmail" CssClass="form-control" placeholder="Your Email Address" runat="server" required="required"></asp:TextBox>
<a id="lnkToggle" style="font-size: smaller" >Sign in with mobile number?</a>

If I click SignIn with mobile then Mobile textbox should be visible, if I sign in with Email than Email textbox should be visible and hide the mobile textbox.