function wopen(url, width, height) {
	window.open(url,'mywindow', 'status=no,toolbar=no,menubar=no,location=no');
	return false;
}
  


function layerVisibility(layerId){
	if (document.getElementById(layerId).style.display == 'none'){
		document.getElementById(layerId).style.display = 'block'; 
	}else{ 
		document.getElementById(layerId).style.display = 'none';
	}
}


/**
* funkcja pokazuje lub chowa warste w zaleznosci od jej obecnego stanu
* COOKIE
*/
function displayLayer(id){
	element = document.getElementById(id);
	if(element.style.display=="none"){
		element.style.display="block";
		document.cookie=id+"=1";
	}else{
		element.style.display="none";
		document.cookie=id+"=0";
	}
}

/**
* funkcja zmienia warstwy
*/
function changeLayer(toShow, toHide){
	elementToShow = document.getElementById(toShow);
	elementToHide = document.getElementById(toHide);
	
	
	elementToShow.style.display="block";
	elementToHide.style.display="none";
	
		
}


function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=")
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1 
    c_end=document.cookie.indexOf(";",c_start)
    if (c_end==-1) c_end=document.cookie.length
    return unescape(document.cookie.substring(c_start,c_end))
    } 
  }
return null
}