Creating HTML element inside a DIV

I have to create multiple checkboxes and display them in html at a specific place in the page.

I have created a div

<div id="htmlDiv">
</div>

and then created checkboxes in javascript (Ihave to create them dynamically),

function createNewCheckboxt(name, id){
var checkbox = document.createElement('input'); 
checkbox.type= 'checkbox';
checkbox.name = name;
checkbox.id = id;
return checkbox;
}

but how can I place these checkboxes in DIV i.e. at specific place in html page ?

Thanks

Aiden