function ZobrazBlockOdkaz(id_odkazu,id)
  { 
    blok=document.getElementById(id).style; 
    odkaz=document.getElementById(id_odkazu).style;
    if(typeof(window.zobraz_block_odkaz_color_active) === 'undefined'){
      window.zobraz_block_odkaz_color_active = 'red';
    }
    
    if(blok.display != 'block'){ 
      blok.display = 'block'; 
      odkaz.color = window.zobraz_block_odkaz_color_active;
    }else{ 
      blok.display = 'none'; 
      odkaz.color = '';
    }   
  }
  
function ZobrazBlock(id)
  { 
    blok=document.getElementById(id).style; 
    if(blok.display != 'block'){ blok.display = 'block';}else{ blok.display = 'none';}
  }