function displayObject(oObj, strObj) {
    // Funkcja pomocnicza do wyświetlania struktury obiektów
    var text = '';
    for(var prop in oObj) {
        var strTemp = oObj[prop]+"\n";
        if(strTemp.search('function') != -1) {
            text += strObj+'.'+prop+': function'+"\n";
        }else{
            text += strObj+'.'+prop+': '+oObj[prop]+"\n";
        }
    }alert(text);
}

/**
  @desc scrolling div content 
  @author Grzegorz Bak <grzegorz.bak@sofpol.com>
*/
var myScroll_class = function() {
    this.lastOffset = 0;
	this.maxSteps = 0; //max liczba krokow
	this.step = 0; //aktualny krok
	this.heightBox = 0; //wysokosc 'scrola'
	this.heightBoxContainer = 0; //wysokosc kontenera dla scrola
	this.maxBoxY = 0;
	this.div = null; //uchwyt do kontenera dla tekstu
	this.maxVisibleArea = 0;
	this.heightArea = 0;
	this.hiddenArea;
	this.prefix = '';
	this.isScrolling = false;
	this.startPosY = 0;
	this.div_2 = null;
	this.idContentToScroll = 'myScroll_content';
	
	this.init = function(div_id,prefix) {
        if(prefix!=undefined) this.prefix = prefix;
	
        try{
            this.div = $(div_id);
        }catch(err){
            alert('myScroll: div not found...')
        }
	
        if(this.div!=null) {
            this.maxVisibleArea = parseInt(this.div.offsetHeight);
            this.heightArea = parseInt(document.getElementById(this.idContentToScroll+this.prefix).offsetHeight);
            //alert('this.maxVisibleArea: '+this.maxVisibleArea+' || this.heightArea: '+this.heightArea+' || this.div.style.height: '+this.div.style.height);
            if(this.maxVisibleArea < this.heightArea) {
                container = document.getElementsByClassName('myScroll_container'+this.prefix);
                container[0].style.display = 'block';
                this.hiddenArea = this.heightArea-this.maxVisibleArea;
            
                div_1 = document.getElementsByClassName('myScrollbar');
                div_1 = div_1[0];
                this.div_2 = document.getElementsByClassName('myScroll_box'+this.prefix);
                this.div_2 = this.div_2[0];
                scrollUp = document.getElementsByClassName('myScroll_arrow_up'+this.prefix);
                scrollUp = scrollUp[0];
                scrollDown = document.getElementsByClassName('myScroll_arrow_down'+this.prefix);
                scrollDown = scrollDown[0];
                
                this.heightBoxContainer = parseInt(div_1.offsetHeight);
                this.heightBox = parseInt(this.div_2.offsetHeight);
                document.lastOffset = 0;
                this.step = parseInt(this.hiddenArea/(this.heightBoxContainer - this.heightBox));
                
                this.maxSteps = this.heightBoxContainer - this.heightBox;
                //div_2.onmousedown = function(){ this.startScroll(); }
                
                // ma sie przewijac tylko kiedy kursor jest nad elementem
                if (window.addEventListener){
                    /** DOMMouseScroll is for mozilla. */
                    //window.addEventListener('DOMMouseScroll', wheel, true);
                    this.div.addEventListener('DOMMouseScroll', wheel, true);
                }else{
                    /** IE/Opera. */
                    //window.onmousewheel = document.onmousewheel = wheel;
                    this.div.onmousewheel = /*document.onmousewheel = */wheel;
                }
                //this.div.observe('mousescroll',wheel);
            
                try{
                    document.getElementsByTagName('body').item(0).attachEvent('onmousemove', this.moveSlider);
                    document.getElementsByTagName('body').item(0).attachEvent('onmouseup', this.stopSlider);
                    this.div_2.attachEvent('onmousedown',this.startScroll);
                    scrollUp.attachEvent('onmousedown',this.clickUp);
                    scrollDown.attachEvent('onmousedown',this.clickDown);
                }catch(err){
                    this.div_2.addEventListener('mousedown', this.startScroll, true);
                    scrollDown.addEventListener('mousedown', this.clickDown, true);
                    scrollUp.addEventListener('mousedown', this.clickUp, true);
                    document.getElementsByTagName('body').item(0).addEventListener('mousemove', this.moveSlider, true);
                    document.getElementsByTagName('body').item(0).addEventListener('mouseup', this.stopSlider, true);
                }
            }
        }
    }

    function moveByScroll(delta){
        if(delta<0) {
            document.lastOffset = document.lastOffset + 35;
            offset = document.lastOffset;
            if(offset>myScroll.maxSteps){
                offset = myScroll.maxSteps;
                document.lastOffset = offset;
            }
            if(offset<0){
                offset = 0;
                document.lastOffset = offset;
            }
        
            st = offset*(myScroll.hiddenArea/myScroll.maxSteps);
            document.getElementById('myScroll_content').style.marginTop = '-'+st+'px';
        
            myScroll.div_2.style.marginTop = offset+'px';
        }
        if(delta>0){
            document.lastOffset = document.lastOffset - 35;
            offset = document.lastOffset;
            //alert(myScroll.step);
            if(offset > myScroll.maxSteps){
                offset = myScroll.maxSteps;
                document.lastOffset = offset;
            }
            if(offset < 0){
                offset = 0;
                document.lastOffset = offset;
            }
        
            st = offset*(myScroll.hiddenArea/myScroll.maxSteps);
            document.getElementById('myScroll_content').style.marginTop = '-'+st+'px';
        
            myScroll.div_2.style.marginTop = offset+'px';
        }
        
        return true;
    }

    function wheel(event) {
        var delta = 0;
        if (!event) /* For IE. */
            event = window.event;
    	if (event.wheelDelta) { /* IE/Opera. */
            delta = event.wheelDelta/120;
            /** In Opera 9, delta differs in sign as compared to IE.
             */
            if (window.opera) delta = -delta;
    	} else if (event.detail) { /** Mozilla case. */
            /** In Mozilla, sign of delta is different than in IE.
             * Also, delta is multiple of 3.
             */
            delta = -event.detail/3;
    	}
    	/** If delta is nonzero, handle it.
    	 * Basically, delta is now positive if wheel was scrolled up,
    	 * and negative, if wheel was scrolled down.
    	 */
    	if (delta) {
    	    moveByScroll(delta);
    	}
    	
    	return true;
    }


    this.startScroll = function(e) {
        myScroll_class.startPosY = e.clientY;
        myScroll_class.isScrolling = true;
    }
  
    this.stopSlider = function(e){
        if(myScroll_class.isScrolling){
            myScroll_class.isScrolling = false;
            offset = e.clientY-myScroll_class.startPosY + document.lastOffset;
            if(offset>myScroll.maxSteps) offset = myScroll.maxSteps;
            if(offset<0) offset = 0;
            document.lastOffset = offset;
            myScroll.div_2.style.marginTop = offset+'px';
        }
    }
  
    this.moveSlider = function(e) {
        if(myScroll_class.isScrolling){
            offset = e.clientY - myScroll_class.startPosY + document.lastOffset;
            if(offset>myScroll.maxSteps) offset = myScroll.maxSteps;
            if(offset<0) offset = 0;
            //alert(myScroll.div_2);
            st = offset*(myScroll.hiddenArea/myScroll.maxSteps);
            document.getElementById('myScroll_content').style.marginTop = '-'+st+'px';
            //document.title = st;
            myScroll.div_2.style.marginTop = offset+'px';
        }
    }

    this.clickDown = function(e){
        document.lastOffset = document.lastOffset + 5;
        offset = document.lastOffset;
        //alert(myScroll.step);
        if(offset>myScroll.maxSteps){
            offset = myScroll.maxSteps;
            document.lastOffset = offset;
        }  
        if(offset < 0){
            offset = 0;
            document.lastOffset = offset;
        }  
    
        st = offset*(myScroll.hiddenArea/myScroll.maxSteps);
        document.getElementById('myScroll_content').style.marginTop = '-'+st+'px';
    
        myScroll.div_2.style.marginTop = offset+'px';
    }
  
    this.clickUp = function(e) {
        document.lastOffset = document.lastOffset - 5;
        offset = document.lastOffset;
        //alert(myScroll.step);
        if(offset>myScroll.maxSteps){
            offset = myScroll.maxSteps;
            document.lastOffset = offset;
        }  
	    if(offset < 0){
            offset = 0;
            document.lastOffset = offset;
        }  

        st = offset*(myScroll.hiddenArea/myScroll.maxSteps);
        document.getElementById('myScroll_content').style.marginTop = '-'+st+'px';

        myScroll.div_2.style.marginTop = offset+'px';
    }
}

var myScroll = new myScroll_class('myScroll');

document.getElementsByClassName = function(className, parentElement) {
    if (typeof parentElement == 'string') {
        parentElement = document.getElementById(parentElement);
    } 
    else if (typeof parentElement != 'object' ||
             typeof parentElement.tagName != 'string'){
        parentElement = document.body;
    }
    var children = parentElement.getElementsByTagName('*');
    var re = new RegExp('\\b' + className + '\\b');
    var el, elements = [];
    var i = 0;
    while ( (el = children[i++]) ) {
        if ( el.className && re.test(el.className)) {
            elements.push(el);
        }
    }
    return elements;
}