if(typeof document.getElementsByClassName != 'function') {
	document.getElementsByClassName = function(className) {
		var children = document.getElementsByTagName('*') || document.all;
		var elements = new Array();
		
		for (var i = 0; i < children.length; i++) {
			var child = children[i];
			var classNames = child.className.split(' ');
			for (var j = 0; j < classNames.length; j++) {
				if (classNames[j] == className) {
					elements.push(child);
					break;
				}
			}
		}
		
		return elements;
	}
}

function lengthenTheBeam() {
	var c_width = document.getElementById('container').offsetWidth;
	var classes = new Array();
	classes[0] = 'przedzial';
	classes[1] = 'przedzial_dol';
	
	var ekran = 0;
	if(document.all) ekran = document.body.offsetWidth; // dla IE
	else ekran = window.innerWidth; // dla normalnych
	
	ekran+=1030;
	var marg = Math.round((ekran-c_width)/2);
	
	var l_cl = classes.length;
	for(var i=0; i<l_cl; i++) {
		var els = document.getElementsByClassName(classes[i]);
		for(var j=0; j<els.length; j++) {
			els[j].style.marginLeft='-'+marg+'px';
			els[j].style.marginRight='0';
			els[j].style.width=ekran+'px';
		}
	}
}

function zmien(nazwaObrazka,naJaki) {
	if (document.images){
		window.document.images[nazwaObrazka].src=naJaki;
	}
}