var myScroll;

function scrollToPort() {
	myScroll.toElement('webdesign');
	outerSlidesBox = $('panes');
	$('panes').tween('height', $('webdesign').getStyle('height'));
	return false;
}

var SlidingTabs = new Class({
	current: null,
	buttons: null,
	contentFrame: null,
	slideContainer: null,
	innerSlidesBox: null,
  	panes: null,
  	positions: null,
	scrollingFx: null,
	start: null,

	initialize: function(buttonContainer, contentFrame, start) {
		this.buttons = $(buttonContainer).getChildren();
		this.contentFrame = $(contentFrame);
		this.slideContainer = this.contentFrame.getFirst();
		this.panes = this.slideContainer.getChildren();
		this.start = $(start);
		
		this.scrollingFx = new Fx.Scroll(this.contentFrame, { duration: 400});		
		
    	
    	this.slideContainer.setStyle('width', (this.contentFrame.offsetWidth.toInt() * this.panes.length) + 'px');

		this.buttons.each( function(button) {
	      button.addEvent('click', this.buttonEventHandler.bindWithEvent(this, button));
    	}.bind(this));
    	    	
    	this.positions = new Array(this.panes.length);

		if(this.start!= null){
			this.start.setStyle('display', 'block');
			//this.contentFrame.setStyle('height', this.start.offsetHeight);
		}
		this.contentFrame.setStyle('height', this.contentFrame.offsetHeight);
    	
		//fuckin IE (7?) does not comes along with this position-stuff after one scroll - therefor i store the positions before first scroll!    	
    	var i = 0;
		this.panes.each(function(pane){			
			pane.setStyle('display','block');
			this.positions[i] = pane.getPosition(this.slideContainer);
			i++;
		}.bind(this));
		
		if(this.start!= null){
			this.contentFrame.scrollTo(this.start.getPosition(this.slideContainer).x, this.start.getPosition(this.slideContainer).y);
		}

	},
	
	//Event-Handler
    buttonEventHandler: function(event, button) {

	//check if the menu item clicked is already active.
	if (this.current == this.buttons.indexOf($(button))){
			return;
		}else{
			

    this.current = this.buttons.indexOf($(button));
	this.buttons.removeClass('active');
   this.buttons[this.buttons.indexOf($(button))].addClass('active');
	
//			if (this.current) {	this.buttons[this.current].removeClass('active'); };
//				this.current = this.buttons.indexOf($(button));
//			if (this.current) { 
//				this.buttons[this.current].addClass('active'); 
//				};
				
			this.scrollingFx.cancel();
			this.scrollingFx.start(this.positions[this.buttons.indexOf($(button))].x,this.positions[this.buttons.indexOf($(button))].y);
			this.contentFrame.tween('height',this.panes[this.current].offsetHeight);
		}
    }    
});