//	otevre nove okno a natahne do neho danou stranku
function photoWindow(url) {
	window.open(url, '', "toolbar=no,status=no,scrollbars=no,resizable=yes,width=400,height=500");
}

//	nastavi stranku jako homepage
function setHomepage(url) {
	if(document.all) {
		document.body.style.behavior='url(#default#homepage)';
		document.body.setHomePage(url);
	}
}

//	check validity of e-mail address
function isEmail(email) {
	reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+'(\\@)([a-zA-Z0-9\\-\\.]+)'+'(\\.)([a-zA-Z]{2,4})$');
	result = (reg.test(email));
	return(result);
}

//	check form formArticleLink in czech
function checkFormArticleLink_cz(form) {
	if(!isEmail(form.email_to.value)) {
		alert('E-mail adresáta není validní adresou!');
		form.email_to.select();
		return false;
	}
	if(!isEmail(form.email_from.value)) {
		alert('E-mail odesílatele není validní adresou!');
		form.email_from.select();
		return false;
	}
	//document.formArticleLink.submit();
	return true;
}

//	check form formArticleLink in english
function checkFormArticleLink_en(form) {
	if(!isEmail(form.email_to.value)) {
		alert('E-mail of recipient is not valid!');
		form.email_to.select();
		return;
	}
	if(!isEmail(form.email_from.value)) {
		alert('E-mail of sender is not valid!');
		form.email_from.select();
		return;
	}
	document.formArticleLink.submit();
}