function Tip(event,message){
  var currentTopOffset = document.documentElement.scrollTop || document.body.scrollTop;
  var currentLeftOffset = document.documentElement.scrollLeft || document.body.scrollLeft;
  var tooltip = document.getElementById('tooltip');
  var text_tt = document.getElementById('text_tt');
  var topPixel = event.clientY - 6;
  var ie_versatz = 0;
  
  if (navigator.appName == 'Microsoft Internet Explorer'){
    var ie_versatz = 6;
  }
  var leftPixel = event.clientX - 158 + currentLeftOffset - ie_versatz; 
 
  tooltip.style.top = currentTopOffset + topPixel + "px";
  tooltip.style.left = leftPixel + "px";
  text_tt.innerHTML = message;
  tooltip.style.visibility = "visible";
}

function hideTip(){
  var tooltip = document.getElementById('tooltip');
  tooltip.style.visibility = "hidden";
}