img_minus = new Image();
img_minus.src = "pics/minus.png";
img_minus2 = new Image();
img_minus2.src = "pics/minus2.png";
img_plus2 = new Image();
img_plus2.src = "pics/plus2.png";

function toggleItem(nId) {
	elem = document.getElementById('i'+nId);

	if( elem != null){
		
		if (elem.src!=null) {
			if(elem.src.indexOf("pics/plus") > -1){
				document.getElementById('s'+nId).style.display = "inline";
				elem.src = "pics/minus.png";
			}else{
				document.getElementById('s'+nId).style.display = "none";			
				elem.src = "pics/plus.png";
			}
		} else {
			if(  (elem.style.listStyleImage.indexOf("pics/plus") > -1) 
					|| ( (elem.style.listStyleImage.length==0) && (elem.className.indexOf("sub_closed")>-1))){
				document.getElementById('s'+nId).style.display = "inline";
				
				if( (elem.style.listStyleImage.indexOf("plus.png") > -1) || (elem.className=="sub_closed_1") ) 
					elem.style.listStyleImage = "url('pics/minus.png')";
				else
					elem.style.listStyleImage = "url('pics/minus2.png')";
				
			} else {
				document.getElementById('s'+nId).style.display = "none";			
				if((elem.style.listStyleImage.indexOf("minus.png") > -1) || (elem.className=="sub_open_1") )
					elem.style.listStyleImage = "url('pics/plus.png')";
				else
					elem.style.listStyleImage = "url('pics/plus2.png')";
			}
		}
	}
}