var submitted = false;

function show_help(){
	document.getElementById('dhlp').style.display = "inline";
	document.getElementById('ahlp').style.display = "none";
	return false;
}
function hide_help(){
	document.getElementById('dhlp').style.display = "none";
	document.getElementById('ahlp').style.display = "inline";
	return false;
}
function show_help2(){
	document.getElementById('dhlp2').style.display = "inline";
	document.getElementById('ahlp2').style.display = "none";
	return false;
}
function hide_help2(){
	document.getElementById('dhlp2').style.display = "none";
	document.getElementById('ahlp2').style.display = "inline";
	return false;
}
function isEmail(who)
{
var email=/^[A-Za-z0-9]+([_\.-][A-Za-z0-9]+)*@[A-Za-z0-9]+([_\.-][A-Za-z0-9]+)*\.([A-Za-z]){2,4}$/i;
return(email.test(who));
}
function check_form() {
	var error = 0;
	var i;

	var error_message = "Nevyplnili ste všetky potrebné údaje!\n\n";
	if(submitted)
	{
		alert( "Tento formulár už bol odoslaný.");
		return false;
	}

	var t_email   = document.getElementById('email').value;
	var c_categories   = document.getElementById('agent_offer').c_positions.value;
	var vybrane_lok   = document.getElementById('agent_offer').c_regions.value;

	document.getElementById('tr_poz').style.background = "transparent";
	document.getElementById('tr_lok').style.background = "transparent";
	document.getElementById('tr_email').style.background = "transparent";

	if ( c_categories.length == '' ) {
	error_message = error_message + "Vyberte aspoň jednu pozíciu.\n";
	document.getElementById('tr_poz').style.background = "#40BF63";
	error = 1;
	}
	if ( vybrane_lok.length == '' ) {
	error_message = error_message + "Vyberte aspoň jeden región.\n";
	document.getElementById('tr_lok').style.background = "#40BF63";
	error = 1;
	}

	if ( t_email.length == '' || !isEmail(t_email)) {
	error_message = error_message + "Zadajte správnu emailovú adresu.\n";
	document.getElementById('tr_email').style.background = "#40BF63";
	error = 1;
	}

	error_message = error_message + "\nChýbajúce položky sú zvýraznené.\n";

	if (error == 1) { alert(error_message); return false; } else { submitted = true; return true; }
}