function updateState(obj){   
  if(obj.selectedIndex > 0) {
    document.forms['theatre']['stateId'].value=0;
    document.forms['theatre']['city'].value=0;
    document.forms['theatre'].submit();
  }      
}

function updateCity(obj) {
  if(obj.selectedIndex > 0) {
    document.forms['theatre']['city'].value=0;
    document.forms['theatre'].submit();
  }
}

function updateSearch() {
  if(document.forms['theatre']['city'].selectedIndex > 0) {
    document.forms['theatre'].submit();
  }
}

function showPage(pageNumber) {
  if(pageNumber && pageNumber > 0) {
    document.forms['theatre']['page'].value=pageNumber;
    document.forms['theatre'].submit();
  }
}