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function changeView(className, idNum, tag, parentID) {  var testClass = new RegExp("(^|\s)" + className + "(\d+(\s|$))");  var showElement = new RegExp("(^|\s)" + className + idNum + "(\s|$)");  var tag = tag || "*";  var elementID = document.getElementById(parentID) || document;  var elements = elementID.getElementsByTagName(tag);  var returnClasses = [];  var current;  var length = elements.length;  for(var i=0; i<length; i++){    current = elements[i];    if(testClass.test(current.className)){      returnClasses.push(current);    }  }  length = returnClasses.length;  for(var i=0; i<length; i++){    current = returnClasses[i];    if (showElement.test(tabs.className)) {      current.style.display = 'block';    } else {      current.style.display = 'none';    }  }}##### HTML Snippet that calls function #####        <div id="storybox">          <ul class="tabs">            <li class="tab_01"><a href="#pop1" onclick="changeView("tab_", "01", "*", "storybox"); return false;" title="">Next</a></li>            <li class="tab_02"><a href="#pop2" onclick="changeView("tab_", "02", "*", "storybox"); return false;" title="">Prev</a></li>          </ul>          <div class="tabcontent tab_01">            ...          </div>          <div class="tabcontent tab_02">            ...          </div>        </div>