var ns;
var sk;
var ie;
browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 
if (browser_name == "Netscape" && browser_version >= 3.0) { brow = 'true'; }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 4.0) { brow = 'true'; }
else { brow = 'false'; }

if (browser_name == "Netscape" && browser_version >= 3) 
  {
    ns=true;
    ie=false;
    sk=false;
  }
else if (browser_name == "Sylaba" && browser_version >= 3)
  {
    sk=true;
    ns=false;
    ie=false;
  }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 4)
  {
    ie=true;
    ns=false;
    sk=false;
  }
else
  {
    ns=false;
    sk=false;
    ie=false;
  }


if(brow)
{
	th = new Image(); 
	th.src = "img/th00.gif"; 
	th_on = new Image(); 
	th_on.src = "img/th01.gif";
	
	t1 = new Image(); 
	t1.src = "img/t100.gif"; 
	t1_on = new Image(); 
	t1_on.src = "img/t101.gif";
	
	t2 = new Image(); 
	t2.src = "img/t200.gif"; 
	t2_on = new Image(); 
	t2_on.src = "img/t201.gif";
	
	t3 = new Image(); 
	t3.src = "img/t300.gif"; 
	t3_on = new Image(); 
	t3_on.src = "img/t301.gif";
	
	t4 = new Image(); 
	t4.src = "img/t400.gif"; 
	t4_on = new Image(); 
	t4_on.src = "img/t401.gif";
	
	t5 = new Image(); 
	t5.src = "img/t500.gif"; 
	t5_on = new Image(); 
	t5_on.src = "img/t501.gif";
	
	t6 = new Image(); 
	t6.src = "img/t600.gif"; 
	t6_on = new Image(); 
	t6_on.src = "img/t601.gif";
	
	tb = new Image(280,28);
  	tb.src = "img/top.jpg";
	
	tbhe = new Image(280,28);
  	tbhe.src = "img/tophe.jpg";
	
	tb1e = new Image(280,28);
  	tb1e.src = "img/top1e.jpg";
	
	tb2e = new Image(280,28);
  	tb2e.src = "img/top2e.jpg";
	
	tb3e = new Image(280,28);
  	tb3e.src = "img/top3e.jpg";
	
	tb4e = new Image(280,28);
  	tb4e.src = "img/top4e.jpg";
	
	tb5e = new Image(280,28);
  	tb5e.src = "img/top5e.jpg";
	
	tb6e = new Image(280,28);
  	tb6e.src = "img/top6e.jpg";
	
}

function img_on(imgName)
{
  if (ie)
  {
    imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
  }
  else if(sk || ns)
  {
    imgOn = eval(imgName + "_on.src");
    document.menu.document [imgName].src = imgOn;
  }
}

function img_off(imgName)
{
  if (ie)
  {
    imgOut = eval(imgName + ".src");
    document [imgName].src = imgOut;
  }
  else if(sk || ns)
  {
    imgOut = eval(imgName + ".src");
    document.menu.document [imgName].src = imgOut;
  }
}

function sym(gdzie,co)
{
  if(ie)
  {
    document.images[gdzie].src=eval(co+".src");
  }
  else if(sk || ns)
  {
    document.menu.document.images[gdzie].src=eval(co+".src");
  }
}