How to make a pop-up if multiple conditions are satisfied

Is there a way for a pop-up to appear when all divs got ‘onmouseovered’?

function moveOver(obj)
            {
                obj.innerHTML = "POP!!!"
                obj.style.color = "#ff0000"
                obj.style.background = "transparent"
                if ()
                {
                    alert("There is no circles left!")
                }
            }

I basically have 12 circles that pop when you move your mouse over them, is there a way to make a pop-up that says “There is no circles left!” after I hover over the 12th circle?