function ToggleVisibleByID(s_element_id) { // First, get an object reference to the element var o_element = document.getElementById(s_element_id); // Next, setup a string var with the element's "class" attrs var theClassName = new String(o_element.className); // Is it hidden? if (theClassName.match("hidden")) { // Yes, so replace hidden with show and set the element's class accordingly. o_element.className = theClassName.replace("hidden", "show"); } else if(theClassName.match("show")) { // No, so do the opposit of the above. o_element.className = theClassName.replace("show", "hidden"); } else { // No, so do the opposit of the above. o_element.className = theClassName.concat("show"); } }