var tree_tpl = {
	'target'  : '_self',
	'icon_e'  : 'images/empty.gif',       // empty image
	'icon_l'  : 'images/line.gif',        // vertical line
  'icon_32' : 'images/pixel_trans.gif', // root leaf icon normal
  'icon_36' : 'images/pixel_trans.gif', // root leaf icon selected
	'icon_48' : 'images/pixel_trans.gif', // root icon normal
	'icon_52' : 'images/pixel_trans.gif', // root icon selected
	'icon_56' : 'images/pixel_trans.gif', // root icon opened
	'icon_60' : 'images/pixel_trans.gif', // root icon selected
	'icon_16' : 'images/pixel_trans.gif', // node icon normal
	'icon_20' : 'images/pixel_trans.gif', // node icon selected
	'icon_24' : 'images/pixel_trans.gif', // node icon opened
	'icon_28' : 'images/pixel_trans.gif', // node icon selected opened
	'icon_0'  : 'images/pixel_trans.gif', // leaf icon normal
	'icon_4'  : 'images/pixel_trans.gif', // leaf icon selected
	'icon_2'  : 'images/joinbottom.gif',  // junction for leaf
	'icon_3'  : 'images/join.gif',        // junction for last leaf
	'icon_18' : 'images/plusbottom.gif',  // junction for closed node
	'icon_19' : 'images/plus.gif',        // junctioin for last closed node
	'icon_26' : 'images/minusbottom.gif', // junction for opened node
	'icon_27' : 'images/minus.gif'        // junctioin for last opended node
};