function isEmpty (str){
    strRE = new RegExp();
    strRE.compile ('^[s ]*$','gi');
    return strRE.test (str.value);
}
function notValidEmail (str) {
    mailRE = new RegExp();
    mailRE.compile ('^[._a-z0-9-]+@[.a-z0-9-]+[.]{1}[a-z]{2,4}$','gi');
    return !(mailRE.test (str.value));
}
function checkForm (form) {
	if (isEmpty (form.res_datum_od)) {
        alert ('Please enter Accommodation from');
        return false;
    }
	if (isEmpty (form.res_datum_do)) {
        alert ('Please enter Accommodation till');
        return false;
    }
	if (isEmpty (form.res_meno)) {
        alert ('Please enter Name and Surname');
        return false;
    }
	if (isEmpty (form.res_telefon)) {
        alert ('Please enter Phone number');
        return false;
    }
	if (notValidEmail (form.res_email)) {
        alert ('Please enter the e-mail or enter valid e-mail');
        return false;
    }
	if (isEmpty (form.number)) {
        alert ('Please enter the Security number');
        return false;
    }

else {
    return true;
	}
}



function Con_notValidEmail (str) {
    mailRE = new RegExp();
    mailRE.compile ('^[._a-z0-9-]+@[.a-z0-9-]+[.]{1}[a-z]{2,4}$','gi');
    return !(mailRE.test (str.value));
}
function Con_checkForm (form) {
	if (isEmpty (form.meno)) {
        alert ('Please enter Name and Surname');
        return false;
    }
   	if (Con_notValidEmail (form.email)) {
        alert ('Please enter the e-mail or enter valid e-mail');
        return false;
    }
else {
    return true;
	}
}