function show_oneofmany( cless , id ) {
	hideClass( cless );
	show( id );
	alignOnLoad();
}

/** ----  UNIVERS ----- **/

function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (typeof element == 'string')
    element = document.getElementById(element);
  return element;
}

function getElementsByClass(searchClass,node,tag) {
   
   var classElements = new Array();
   var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
   node = (node == null) ? document : node;
  
   if ((document.getElementsByTagName("*").length > 0) || (tag != null)){
      tag = (tag == null) ? "*" : tag;
      var els = node.getElementsByTagName(tag);
      var elsLen = els.length;
      for (i = 0, j = 0; i < elsLen; i++){
         if (pattern.test(els[i].className)){
            classElements[j] = els[i];
            j++;
         }
      }
   }else{
      var els = node.all;
      var elsLen = els.length;
      for (i = 0, j = 0; i < elsLen; i++){
         if (pattern.test(els[i].className)){
            classElements[j] = els[i];
            j++;
         }
      }
   }
   return classElements;
} 


function hideClass(cls){
  var toHide = getElementsByClass(cls);
  for(i=0; i<toHide.length; i++){
    toHide[i].style.display = "none";
  }
}

function showClass(cls){
  var toShow = getElementsByClass(cls);
  for(i=0; i<toShow.length; i++){
    toShow[i].style.display = "block";
  }
}


function checkClass(cls, val){
  var toShow = getElementsByClass(cls);
  for(i=0; i<toShow.length; i++){
    toShow[i].checked = val;
  }
}

function show(id)
{
  document.getElementById(id).style.display="block"; 
}
   
function isVisibleClass( cls ) {
	var toShow = getElementsByClass(cls);
	if( !( toShow[0] == undefined ) )
		return ( toShow[0].style.display == 'none')? false : true ;
	else
	 	return false;
}
          
function hide(id)
{
  document.getElementById(id).style.display="none";           
}



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

function alignOnLoad() {
	if( document.getElementById('boxx1') != null )
		align( 'boxx1' );
	if( document.getElementById('boxx2') != null )
		align( 'boxx2' );
}

/* rowna do glownego kontenera */
function align( id ) {
	var main_size = document.getElementById('container_middle').clientHeight - 40 ;
	var child = document.getElementById( id ) ;
	if( child.clientHeight < main_size ) {
		child.style.height = main_size - 40 +'px';
	}
}



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 = '';
}