// JavaScript Document

  var show = 0;

	function vis(el)
	{
	  var element = document.getElementById(el);
	  if (element.style.display != ''){
	  	element.style.display = '';	  
	  } else{
	  	element.style.display = 'none';
	  }
	}	
	
	function visall()
	{
	  elements = document.getElementsByTagName('div');
    for(foo = 0; foo < elements.length; foo++){
	     if ((elements[foo].className == 'hlp') || (elements[foo].className == 'rozbor') || (elements[foo].className == 'postup') || (elements[foo].className == 'diskuze')) {
     	  var element = elements[foo];
    	  if (show == 0){
    	  	element.style.display = '';	  
    	  } else{
    	  	element.style.display = 'none';
    	  }
       }
	  }
    if (show == 0 && elements.length > 0) {
      show = 1;
    } else {
      show = 0;
    }
	}