function cssCheck() {

  var pc = (navigator.platform.indexOf('Win') != -1);
  
  var mac = (navigator.platform.indexOf('Mac') != -1); 
  
  var linux = (mac != true && pc != true)? true: false;
  
  var n4 = (document.layers)? true : false;
  
  var ie = (document.all)? true : false;
  
  var opera = (navigator.userAgent.indexOf('Opera') != -1);
  
  stil = "";
  
  if (mac) {
  
		stil = "/css/styles.css";
  
  } else {
      
      if ( (pc && n4) || (pc && opera) || linux ) {
    
          stil = "/css/styles_n4.css";
          
      } else {
          stil = "/css/styles.css";
      }
  }

  return stil;

}

  var tip="";
  
  function closeIt(id){
    document.getElementById(id).style.visibility="hidden";
  }
  
  function showIt(id){
  tip=document.getElementById(id).style;
 
  mouseX = window.event.clientX + 10;
	mouseY = window.event.clientY -15;
    
  tip.left=mouseX;
  tip.top=mouseY;
  tip.visibility="visible";

  }