Hi
The code will look some thing like this
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />
<input type="button" id="criarNota" onclick="criarNota();" value="Criar Nota" />
<input type="button" id="botaoCarregarNotas" onclick="botaoCarregarNotas();" style="display:none;" value="Carregar Notas" />
</form>
Now the Javascript function will look like
function criarNota(){
document.getElementById("botaoCarregarNotas").style.display = "block";
}
Thanks
Hope this helps