我希望textbox AJAX Mask Edit Extender根据单选按钮进行更改

I creating an ASP.net online application with C# background. I am also using AJAX MaskEditExtender. I'm pretty new to AJAX and don't know Javascript. What I need to do is have the textbox AJAX mask change based on the selection of the radio buttons. In this example they are choosing salary or hourly. I need the salary to be "999,999" and the hourly to be "99.99".I creating an ASP.net online application with C