function handleClick(whichObj, changeImage) 
{
	if (!changeImage) changeImage = false;

	if (document.getElementById) 
	{
		// this is the way the standards work
		// Version mit visibility: document.getElementById(whichObj).style.visibility = "hidden"; oder = "visible"
		if (document.getElementById(whichObj).style.display=="none")
		{
			document.getElementById(whichObj).style.display = "inline";
			if (changeImage)document.getElementById(changeImage).src = "pics/minus_blau.gif";
		}
		else
		{
			document.getElementById(whichObj).style.display = "none";
			if (changeImage)document.getElementById(changeImage).src = "pics/plus_blau.gif";
		}
		
	}
	else if (document.all) 
	{
		// this is the way old msie versions work
		if (document.all[whichObj].style.visibility == "none")
		{
			document.all[whichObj].style.visibility = "inline";
			document.all[whichObj].src = "pics/minus_blau.gif";
		}
		else
		{
			document.all[whichObj].style.visibility = "none";
			document.all[whichObj].src = "pics/plus_blau.gif";
		}
	}
	else if (document.layers) 
	{
		// this is the way nn4 works
		if (document.layers[whichObj].visibility == "none")
		{
			document.layers[whichObj].visibility = "inline";
		}
		else
		{
			document.layers[whichObj].visibility = "none";
		}
		
	}
}