function start() {
 if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){
  alert('using IE');
  exit;
  }

 makeCollapsible();
}

function makeCollapsible() {
 myBody = document.getElementById('metalvideos');
 myBodyElements = myBody.getElementsByTagName('li');

 for (var i = 0; i < myBodyElements.length; i++) {
  myBodyElements[i].style.display='none';
 }

}

function unCollapse(targetElementName) {

 targetElement=document.getElementById(targetElementName);

 if (targetElement.style.display=='none') {
  targetElement.style.display='block';
 }

 else if (targetElement.style.display=='block') {
  targetElement.style.display='none';
 }

}