objectsToHideById.push('expo_form_company_name');
objectsToHideById.push('expo_form_city');
objectsToHideById.push('expo_form_country');
objectsToHideById.push('expo_form_product_group');
objectsToHideById.push('expo_form_product');
objectsToHideById.push('expo_form_hall');

function selLetter(letter)
{
	document.filterform.expo_form_company_name.value = letter
	document.filterform.expo_form_city.value = ''
	document.filterform.expo_form_country.value = ''
	document.filterform.expo_form_product_group.value = ''
	document.filterform.expo_form_product.value = ''
	document.filterform.expo_form_hall.value = ''
	document.filterform.submit()
}