function beforeSendReq(f) {

	if (f.nev.value == "")
	{
		alert('Please fill in all marked fields!');
		f.nev.focus();
		return false;
	}
	
	if (f.telefon.value == "")
	{
		alert('Please fill in all marked fields!');
		f.telefon.focus();
		return false;
	}

	if (f.email.value.search(/^.+@.+\..+$/)!=0)
	{
		alert('Please enter an existing email adress!');
		f.email.focus();
		return false;
	}

	if (f.varos.value == "")
	{
		alert('Please fill in all marked fields!');
		f.varos.focus();
		return false;
	}

	if (f.irszam.value == "")
	{
		alert('Please fill in all marked fields!');
		f.irszam.focus();
		return false;
	}

	if (f.utca_hsz.value == "")
	{
		alert('Please fill in all marked fields!');
		f.utca_hsz.focus();
		return false;
	}

	else return true;
}