Walls North Walls South Other × Wall North 1 Wall North 2 Wall North 3 Wall North 4 Wall North 5 × Wall South 1 Wall South 2 Wall South 3 × Other 1 (Location unknown) function openStreet(evt, cityStreet) { var i, tabcontentstreet, tablinks; tabcontentstreet = document.getElementsByClassName("tabcontentstreet"); for (i = 0; i < tabcontentstreet.length; i++) { tabcontentstreet[i].style.display = "none"; } tablinks = document.getElementsByClassName("tablinks"); for (i = 0; i < tablinks.length; i++) { tablinks[i].className = tablinks[i].className.replace(" active", ""); } document.getElementById(cityStreet).style.display = "block"; evt.currentTarget.className += " active"; } // Get the element with id="defaultOpen" and click on it document.getElementById("defaultOpen").click();