function eraseInput(input, text){
        if(input.value != '' && input.value == text){
            input.value = '';
        }
    }
    
    function setDefaultInputText(input, text){
        if(input.value == ''){
            input.value = text;
        }
    }
    
    
    
    
    
    function toggleElementOff(i){
    
    	element = document.getElementById("sub" + i).style;
        element.display = 'none';
        
        element = document.getElementById("off" + i).style;
        element.display = 'none';
        
        element = document.getElementById("on" + i).style;
        element.display = 'block';
        
    }
    
    function toggleElementOn(i){
    
    	element = document.getElementById("sub" + i).style;
        element.display = 'block';
        
        element = document.getElementById("on" + i).style;
        element.display = 'none';
        
        element = document.getElementById("off" + i).style;
        element.display = 'block';
        
            
    }
    
    
    function JSCookiesTest() {
    
        //Vytvořím cookie, přečtu jí, rozhodnu, jestli to sedí,
        //z toho vyvodim; jestli je cookies on nebo off a cookie smazu.
        
        var cookieEnabled = false;
        var future = new Date();
        var past = new Date();
    	future.setTime(future.getTime()+(1*24*60*60*1000));
        past.setTime(past.getTime()-(1*24*60*60*1000));
        
        var future = future.toGMTString();
        var past = past.toGMTString();
        
        document.cookie = "test=abc; expires="+future;;
        cookieEnabled = (document.cookie != "");
        
        document.cookie = "test=abc; expires="+past;;
                
        if(cookieEnabled){
          skryj('JSCookiesTest');
        }
    }
    
    function skryj(ID) {
      	element = document.getElementById(ID).style;
      	element.display = 'none';
    }