function validate_email(frm) {

	if(frm.elements['jmeno'].value == '') {
		alert('Je nutno vyplnit pole JMENO');
		frm.elements['jmeno'].select();
		return false;
	}
	
  if (!check_email(frm.elements['email'].value, 'EMAIL')) return false;
  
	return true;
}


function check_email2(email, notice) {
  if (email == '') {
		alert('Je nutno vyplnit pole: ' + notice);
		return false;
	}
  var RegExp = /^((([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|\/|=|\?|\^|_|`|\{|\||\}|~)+(\.([a-z]|[0-9]|!|#|$|%|&|'|\*|\+|\-|\/|=|\?|\^|_|`|\{|\||\}|~)+)*)@((((([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.))*([a-z]|[0-9])([a-z]|[0-9]|\-){0,61}([a-z]|[0-9])\.)[\w]{2,4}|(((([0-9]){1,3}\.){3}([0-9]){1,3}))|(\[((([0-9]){1,3}\.){3}([0-9]){1,3})\])))$/
  if(RegExp.test(email)){
    return true;
  }else{
    alert('Chybně zadané pole: ' + notice);
    return false;
  } 
}    

function check_email(email, notice) {
  if (email == '') {
		alert('Je nutno vyplnit pole: ' + notice);
		return false;
	}
	regex = /^((\"[^\"\f\n\r\t\v\b]+\")|([\w\!\#\$\%\&'\*\+\-\~\/\^\`\|\{\}]+(\.[\w\!\#\$\%\&'\*\+\-\~\/\^\`\|\{\}]+)*))@((\[(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))\])|(((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9])))|((([A-Za-z0-9\-])+\.)+[A-Za-z\-]+))$/;
	if(!regex.test(email)) {
		alert('Chybně zadané pole: ' + notice);
		return false;
	}
	return true;
}