function sbal(id) {
      //safe function to hide an element with a specified id
          	if (document.getElementById) { // DOM3 = IE5, NS6
          		document.getElementById(id).style.display = 'none';
          	}
          	else {
          		if (document.layers) { // Netscape 4
          			document.id.display = 'none';
          		}
          		else { // IE 4
          			document.all.id.style.display = 'none';
          		}
          	}
          //nastaveni cookie
          }
function rozbal(id) {
    	//safe function to show an element with a specified id

    	if (document.getElementById) { // DOM3 = IE5, NS6
    		document.getElementById(id).style.display = 'block';
    	}
    	else {
    		if (document.layers) { // Netscape 4
    			document.id.display = 'block';
    		}
   else { // IE 4
    	document.all.id.style.display = 'block';
    	}
    }
    //nastaveni cookie
    }
function rozbalSbal(id)
    {
    if(document.getElementById(id).style.display=='none'){rozbal(id);}else{sbal(id);};
    }
function setCookie(c_name,value,expiredays)
    {
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie=c_name+ "=" +escape(value)+
    ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
    }
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 "";
}