On Click => Excecute 2 Javascript Functions

I have a form with 2 submit buttons, "Test" and "Save".

I also have to javascript functions, "TestImage" and "SaveImage".

What I want to do is, when the "Test" button get's clicked, then execute the "TestImage" function. That was easy, I did it like this:

<input type="submit" name="test" value="Test" onClick="return TestImage(this);">

But what I also want is, when someone clicks on the "Save" button, to first execute the "TestImage" function, and then the "SaveImage" function. Anyone know how I can do this?