TextBox Validation

<asp:TextBox ID="txt_orgcode" runat="server" class="form_input" ToolTip="Enter Corporation Code" onkeypress="return AlphaIntonly(event)" >                         </asp:TextBox>                         <span class="flderror fld1-error"></span>   $('#PageContent_txt_orgnamell').focus(function () {                 org_code = document.getElementById('PageContent_txt_orgcode').value;                 org_name = document.getElementById('PageContent_txt_orgname').value;   & ...