function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  }
  else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}



function hideShow() {
  
  var infoDiv = document.getElementById('divclinical');
  
  var i1 = document.getElementById('showclinical'); 

    infoDiv.style.display = 'none';
  
  i1.onclick = function() {
   if ( infoDiv.style.display == 'none') {
    infoDiv.style.display = 'block'; 
     i1.innerHTML="HIDE CLINICAL STUDIES...";
   }
    else {
      infoDiv.style.display = 'none';
      i1.innerHTML="SHOW CLINICAL STUDIES...";
    }
  }
}

addLoadEvent(hideShow);