HTML javascript checkbox function

I have a scenario where, when I check Bills Available checkbox, a Image Upload camera function should pop-up. I can write the came function for "Image Upload" later. But i need "Image Upload" displayed when I check "Bills Available"

function calc()
{
var update=false;
console.log("update is" + update);
}

<td><input class="pop" id="exp" type="checkbox"  name="bill available" value="" onchange="calc();"/>Bill available<br></td>