function zmiana_display(id)
{
	var element = document.getElementById(id).style;
	var img_id = 'img_' + id;
	var obrazek = document.getElementById(img_id);
	var id_meni = '';
	if(element.display == 'block')
	{
 	   for (var i=1;i<=3;i++)
    	{	   
		 		document.getElementById('menu_'+i).style.display = 'none';
				SetCookie('menu_'+i, '1');
				id_meni = 'img_menu_' + i;
				document.getElementById(id_meni).src = 'images/plus.gif';
  	   }	
	}
	else
	{
		element.display = 'block';
		SetCookie(id, '0');
		obrazek.src = 'images/minus.gif';

 	   for (var i=1;i<=3;i++)
    	{	   
    		if(id != 'menu_'+i)
			{    	
		 		document.getElementById('menu_'+i).style.display = 'none';
				SetCookie('menu_'+i, '1');
				id_meni = 'img_menu_' + i;
				document.getElementById(id_meni).src = 'images/plus.gif';
			}	
  	   }
  	   
	}
}

function SetCookie(sName, sValue)
{
  date = new Date();
  document.cookie = escape(sName) + "=" + escape(sValue) + "; path=/; expires=Fri, 31 Dec 2099 23:59:59 GMT;";
}