var pole = window.location.search.substr(1).split("&"); 
	// location.search je ta zajímavava cast adresy za otaznikem, 
	// substr(1) odebere nulty znak (otaznik), split("&") to rozseká podle &

var httpGetVars = new Array(); 
for(i = 0; i < pole.length; i++){
	httpGetVars[pole[i].split("=")[0]] = unescape(pole[i].split("=")[1]); 
}
selmenu=httpGetVars['chap'];

function menuclick(id) {
//  alert(id+'  '+selmenu);
    
	el=document.images["menu"+selmenu];
    if (el) {el.style.visibility="hidden"};    
	el=document.getElementById["submenu"+selmenu];
	if (el) {el.style.display="none"}; 
	selmenu=id;
	el=document.images["menu"+selmenu];
    if (el) {el.style.visibility="visible"};    
    el=document.getElementById('submenu'+id);
    if (el) {el.style.display="block"}; 
    return false;
};

function menuitem(id,mytext) {
  document.write("<tr class='menu_item'>"); 
  document.write("<td> <IMG id='menu"+id+"' SRC='arrowsm.gif' WIDTH='16' HEIGHT='16' ALIGN='top'></td>");
  document.write("<td  class='menu_label'>");
  document.write("<a class='menu_link' href='?chap="+id+"'>");   
//  document.write("<a class='menu_link' href='"+myhref+"'>");  
  document.writeln(mytext+"</a></td></tr>");
  document.images['menu'+id].style.visibility='hidden';
};

function menuitemex(id,mytext,refs,captions,n) {
  document.write("<tr class='menu_item'>"); 
  document.write("<td> <IMG id='menu"+id+"' SRC='arrowsm.gif' WIDTH='16' HEIGHT='16'></td>");
  document.write("<td class='menu_label'>");
  document.write("<a class='menu_link' href='#' " +
     "onmouseover=\"window.status='"+mytext+"'; return true;\" onclick=\"menuclick("+id+")\">");  
  document.writeln(mytext+"</a>");
  submenu(id,refs,captions,n); 
  document.writeln("</td></tr>");
  document.images['menu'+id].style.visibility='hidden';
};

function submenu(id,refs,captions,n) {
    document.writeln("<DIV id='submenu"+id+"' class='submenu_label'>");  
	for (i=0;i<n;i++) {
      document.write("<a class='menu_link' href='"+refs[i]+"'>");  
      document.writeln(captions[i]+"</a><BR>");
  };
    document.writeln("</DIV>");  
    document.getElementById('submenu'+id).style.display='none';
//    document[id].style.display='none'; 
};