You should be able to do it like this.
JavaScript
function buttonClick() {
Ingredient();
document.getElementById('_set').value='vToggle \'ON\'';
Submit();
};
HTML
<button onclick="javascript: buttonClick();">Click me</button>
But be aware that you load the script that creates the function before the button loads.
If you don't want to load your function before the button is loaded you need to delay the binding to the click event. See this Fiddle for a demo.
HTML
<button id="ingredientButton">Click me</button>
JavaScript
document.onreadystatechange = function() {
document.getElementById("ingredientButton").onclick = function() {
Ingredient();
document.getElementById('_set').value='vToggle \'ON\'';
Submit();
};
}
