NC = document.layers;
dom = document.getElementById;
document.height = 0;
IE = document.all;

bloks = new Array('blok1', 'blok2', 'blok3', 'blok4', 'blok5', 'blok6', 'blok7', 'blok8', 'blok9', 'blok10');

function stend(pr) 
 { CloseAll();
   if (NC)
     {    if (document.layers[pr])
           document.layers[pr].visibility = "show";
             else if (dom)
           if (document.getElementById(pr))
           document.getElementById(pr).visibility = "show";
      }
    else
      { CloseAll();
   if (IE)
    if (document.all[pr])
     document.all[pr].style.visibility = "visible";
   else if (dom)
    if (document.getElementById(pr))
     document.getElementById(pr).style.visibility = "visible";
 }
}
  function BlokC(pr) 
  { if (NC)
    {if (document.layers[pr])
     document.layers[pr].visibility = "hide";
   else if (dom) 
    if (document.getElementById(pr))
     document.getElementById(pr).visibility = "hide"; 
   }
 else
 { if (IE)
    if (document.all[pr])
     document.all[pr].style.visibility = "hidden";
   else if (dom) 
    if (document.getElementById(pr))
     document.getElementById(pr).style.visibility = "hidden"; 
 }
}
  function CloseAll(pr) 
  { for (i = 0; i < bloks.length; i++)
     BlokC(bloks[i]);
   }