//The vertical menu

//Description : Description, collapse or unfold a branch
function toggle(node, image1, image2, imageid) 
{
    var i = document.getElementById(imageid);

    // Get the next tag (read the HTML source)
	var nextDIV = node.nextSibling;
	
	// find the next DIV	
	while(nextDIV.nodeName != "DIV") 
	{
		nextDIV = nextDIV.nextSibling;
	}
	// expand
	if (nextDIV.style.display == 'none') 
	{
		// Change the image (if there is an image)		
	    i.src = 'files/design/'+image1;
		nextDIV.style.display = 'block';
		node.style.marginBottom ='0px';
	}
	// Collapse 
	else 
	{	
		// Change the image (if there is an image)		
		i.src = 'files/design/'+image2;
		nextDIV.style.display = 'none';
		node.style.marginBottom ='10px';
	}
}