menu_oth = new Image();
        menu_oth.src = "img/rec_green.jpg";
        img_green =menu_oth.src ;
        
      
        menu_oth2 = new Image();
        menu_oth2.src = "img/rec_gray.jpg";
       img_grey =menu_oth2.src  ;

function rozbal(menu){
    if ( document.getElementById(menu).style.display=="none"){
          document.getElementById(menu).style.display="block";
         
         }
     else    {
         document.getElementById(menu).style.display="none";
     } 
     
}

 function zvyrazni(menu){
        document.getElementById('aID_'+menu).style.listStyleImage="url("+img_green+")";
        document.getElementById('aID_'+menu).style.color="black";
        document.getElementById('aID_'+menu).style.fontWeight="bold";
}

  function zesvetli(menu){
        document.getElementById('aID_'+menu).style.listStyleImage="url("+img_grey+")";
        document.getElementById('aID_'+menu).style.color="#676B6C";
        document.getElementById('aID_'+menu).style.fontWeight="normal";
}

function nastav(){
  document.getElementById(1).style.display="none";
  document.getElementById(2).style.display="none";
}
function kontrola()
{
    re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$/;
   
    
    if(form_mail.email.value.search(re)==0){
    
       return true;
    }
    else {
       alert("Nesprávný formát emailu");
       return false;
    }
    
    
}