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Change first letter of a text-box capital using JavaScript

Use following function inside textbox. It will change the first letter of text-box to capital when focus goes out from text-box.
  1. onblur="this.value = this.value.substr(0, 1).toUpperCase() + this.value.substr(1);" 
Example
  1. <asp:TextBox ID="txtuser" runat="server" placeholder="User Name" autocomplete="off" onblur="this.value = this.value.substr(0, 1).toUpperCase() + this.value.substr(1);"></asp:TextBox>