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function negateIdDisplay(which) { var e = document.getElementById(which); if (e.style.display=="block") { e.style.display="none" } else { e.style.display="block" } } function setClassDisplay(which,what) { var e = document.getElementsByClassName(which); for ( var i = 0; i < e.length; i++ ) { e[i].style.display=what } }