function TotalFeesDesable() { document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees").Enabled=false; }
<asp:TextBox ID="txt_totalfees" runat="server" onblur="TotalFeesDesable()"></asp:TextBox>
document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees").disabled = true;
<asp:TextBox ID="txt_totalfees" runat="server" onblur="javascript: return TotalFeesDesable()"></asp:TextBox>
var
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