/* menu slider */
var SlideList = new Class({
	initialize: function(menu, options) {
		this.setOptions(this.getOptions(), options);
		
		this.menu = $(menu), this.current = this.menu.getElement('li.current');
		
		this.menu.getElements('li').each(function(item){
			item.addEvent('mouseover', function(){ this.moveBg(item); }.bind(this));
			item.addEvent('mouseout', function(){ this.moveBg(this.current); }.bind(this));
			item.addEvent('click', function(event){ this.clickItem(event, item); }.bind(this));
		}.bind(this));
				
		this.back = new Element('li').addClass('background').adopt(new Element('div').addClass('left')).injectInside(this.menu);
		this.back.fx = this.back.effects(this.options);
		if(this.current) this.setCurrent(this.current);
	},
	
	setCurrent: function(el, effect){
		this.back.setStyles({left: (el.offsetLeft)+'px', width: (el.offsetWidth)+'px'});
		(effect) ? this.back.effect('opacity').set(0).start(1) : this.back.setOpacity(1);
		this.current = el;
	},
	
	getOptions: function(){
		return {
			transition: Fx.Transitions.sineInOut,
			duration: 500, wait: false,
			onClick: Class.empty
		};
	},

	clickItem: function(event, item) {
		if(!this.current) this.setCurrent(item, true);
		this.current = item;
		this.options.onClick(new Event(event), item);
	},

	moveBg: function(to) {
		if(!this.current) return;
		this.back.fx.custom({
			left: [this.back.offsetLeft, to.offsetLeft],
			width: [this.back.offsetWidth, to.offsetWidth]
		});
	}
});

SlideList.implement(new Options);

function addOnLoad( fun ) {
	var oldf = window.onload ;
	if( typeof oldf != 'function' ) {
		window.onload = fun;	
	} else {
		window.onload = function() {
			if( oldf ) oldf();
			fun();
			
		}
	}
}

var which = 1;
function swap() {
  var el1 = $('i1a') ;
  var el2 = $('i1b') ;
  if (which == 1){
  	//alert('a');
  	fadeIn( 'i1b', 0 );
  	fadeOut( 'i1a', 100 );
  	which = 2;
  } else {
  	//alert('b');
  	fadeIn( 'i1a', 0 );
  	fadeOut( 'i1b', 100 );
  	which = 1;
  }
}

/* podmiana zdjecna glownej stronie */
function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 5;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 75);
    }
  }
}

function fadeOut(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity >= 0) {
      setOpacity(obj, opacity);
      opacity -= 5;
      window.setTimeout("fadeOut('"+objId+"',"+opacity+")", 75);
    }
  }
}

function show_hide( id_show, id_hide ) {
	$(id_show).style.display = 'block';
	$(id_show+'_m').className = 'chose';
	$(id_hide).style.display = 'none';
	$(id_hide+'_m').className = '';
}