function Validate(frm) {
var form = document.getElementById(frm);
var alerttext = "";
//email
regExpPatternemail=/^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.(([0-9]{1,3})|([a-zA-Z]{2,3})|(aero|coop|info|museum|name))$/
with (form.cf_email) {
	  if (value==null || value=="")
		    alerttext += "Povinná položka 'E-mail'.\n";
	  else if (!regExpPatternemail.test(value)) alerttext += "Nesprávný formát položky 'E-mail'\n";
    }
with (form.cf_name) {
	  if (value==null || value=="")
		    alerttext += "Povinná položka 'Jméno'.\n";
    }
with (form.cf_question) {
	  if (value==null || value=="")
		    alerttext += "Povinná položka 'Vložit dotaz'.\n";
    }
if (alerttext.length > 0) {
    alert(alerttext);
    return false;
    }
    else return true;
}