var imgPath		= "images/";
folderOn		= new Image();
folderOff		= new Image();
folderOn.src	= imgPath + "folder_open.gif";
folderOff.src	= imgPath + "folder.gif";

function switchFolder(layerName)
{
	if (document.images)
	{
		imageName = "f"+layerName;
		if (displayLayer(layerName))
		{
			document.images[imageName].src = folderOn.src;
		} else {
			document.images[imageName].src = folderOff.src;
		}
	}
}


function roll(name,source)
{
	if (document.images) 
	{
		eval("document.images."+name+".src = '"+source+"' ;");

	}
}