function manage_link(path_to_file, image_name) { //v3.0
	parent.mainFrame.location.href = path_to_file;
	
	
	document.emptyimage_1_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_2_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_3_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_3_1.src = "images/simple_tree/empty.gif";
	document.emptyimage_3_2.src = "images/simple_tree/empty.gif";
	document.emptyimage_4_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_4_1.src = "images/simple_tree/empty.gif";
	document.emptyimage_4_2.src = "images/simple_tree/empty.gif";
	document.emptyimage_4_3.src = "images/simple_tree/empty.gif";
	document.emptyimage_5_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_5_1.src = "images/simple_tree/empty.gif";
	document.emptyimage_5_2.src = "images/simple_tree/empty.gif";
	document.emptyimage_5_3.src = "images/simple_tree/empty.gif";
	document.emptyimage_6_0.src = "images/simple_tree/empty.gif";
	document.emptyimage_6_1.src = "images/simple_tree/empty.gif";
	document.emptyimage_6_2.src = "images/simple_tree/empty.gif";
	document.emptyimage_7_0.src = "images/simple_tree/empty.gif";
	//
	document.images[image_name].src = "images/simple_tree/open.gif";
	
}