//animate the opening of the branch (span.grower jQueryElement)
function openBranch(jQueryElement, noAnimation) {
	
	var openClass = 'OPEN';
	var closeClass = 'CLOSE';
	if(jQueryElement.next().attr('rel') != '') {
		openClass += "_" + jQueryElement.next().attr('rel');
		closeClass += "_" + jQueryElement.next().attr('rel');
	}
	jQueryElement.addClass(openClass).addClass("OPEN").removeClass(closeClass).removeClass('CLOSE');
	jQueryElement.parent().find('ul:first').show();
}
//animate the closing of the branch (span.grower jQueryElement)
function closeBranch(jQueryElement, noAnimation) {
	var openClass = 'OPEN';
	var closeClass = 'CLOSE';
	if(jQueryElement.next().attr('rel') != '') {
		openClass += "_" + jQueryElement.next().attr('rel');
		closeClass += "_" + jQueryElement.next().attr('rel');
	}
	jQueryElement.addClass(closeClass).addClass('CLOSE').removeClass(openClass).removeClass('OPEN');
	jQueryElement.parent().find('ul:first').hide();
}

//animate the closing or opening of the branch (ul jQueryElement)
function toggleBranch(jQueryElement, noAnimation) {
	if(true === jQueryElement.hasClass('OPEN')) {
		closeBranch(jQueryElement, noAnimation);
	} else {
		openBranch(jQueryElement, noAnimation);
	}
}

//when the page is loaded...
$(document).ready(function () {
	//to do not execute this script as much as it's called...
	if(!$('ul.tree.dhtml').hasClass('dynamized'))
	{
		//add growers to each ul.tree elements
		$('ul.tree.dhtml ul').prev().before("<span class='grower OPEN'> </span>");
		
		//dynamically add the '.last' class on each last item of a branch
		$('ul.tree.dhtml ul li:last-child, ul.tree.dhtml li:last-child').addClass('last');
		
		//collapse every expanded branch
		$('ul.tree.dhtml span.grower.OPEN').addClass('CLOSE').removeClass('OPEN').parent().find('ul:first').hide();
		$('ul.tree.dhtml span.grower').each( function() {
			if($(this).next().attr('rel') != '' ){
				$(this).addClass('CLOSE_'+$(this).next().attr('rel'));
			}
		});
		$('ul.tree.dhtml').show();
		
		//open the tree for the selected branch
			$('ul.tree.dhtml .selected').parents().each( function() {
				if ($(this).is('ul'))
					toggleBranch($(this).prev().prev(), true);
			});
			toggleBranch( $('ul.tree.dhtml .selected').prev(), true);
		
		//add a fonction on clicks on growers
		$('ul.tree.dhtml span.grower').click(function(){
			toggleBranch($(this));
		});
		//mark this 'ul.tree' elements as already 'dynamized'
		$('ul.tree.dhtml').addClass('dynamized');

		$('ul.tree.dhtml').removeClass('dhtml');
	}
});