function skryj(idecko){
el=document.getElementById(idecko).style; 
el.display='none';

}

function zobraz(idecko){
el=document.getElementById(idecko).style; 
el.display='block';

}


function zobrazSkryj(idecko){
el=document.getElementById(idecko).style; 
el.display=(el.display == 'block')?'none':'block';

}

function set_select(ID, myValue) {
  returnObjById(ID).value = myValue;
  returnObjById(ID).style.backgroundColor = '#79a7d2';
}