NoVNC scripted button press

Question

I'm in the process of customizing NoVNC for my application and I'm wondering how to automatically have the remember me button pressed when logging in through NoVNC. I assume it's something like:

<script>
function buttonclick(){
var pagebutton= document.getElementById("<ButtonID>";
pagebutton.click();
}
</script>

But I can't figure out where I should put it to be called when needed. I apologize if this is a noob question, I am admittedly new to programming and this is my first question on Stack Overflow.

Thanks guys!!