String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

 function checkEmail(){
    re = new RegExp("^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,4}$");
    if (!re.test(document.getElementById("email").value)) {
      window.alert("Emailová adresa nemá správný formát / The email adress is invalid");
      return false;
    } else {
    return true;
    }
}

 function checkPoukaz(){
    re = new RegExp("^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,4}$");
    if (!re.test(document.getElementById("emailp").value)) {
      window.alert("Emailová adresa nemá správný formát");
      return false;
    }
	
	var title = document.getElementById("title").value;
	if (title.trim() == "") {
      window.alert("Nevyplnili jste oslovení");
      return false;
	}
		
	var name = document.getElementById("name").value;
	if (name.trim() == "") {
      window.alert("Nevyplnili jste jméno");
      return false;
	}
	
	var antispam = document.getElementById("antispam").value;
	if (antispam.trim() == "") {
		window.alert("Nevyplnili jste antispam");
		return false;
	} else {
		var today = new Date();
		var thisDay = today.getDay();
		var myDays = ["nedele","pondeli","utery","streda","ctvrtek","patek","sobota","nedele"];
		thisDay = myDays[thisDay];
		
		antispam = antispam.toLowerCase();
			
		var arr = new Array("ě", "ú", "č", "ř", "í", "ý", "á"); 
		 var by = new Array("e", "u", "c", "r", "i", "y", "a"); 
		 for (var i=0; i<arr.length; i++) { 
			 antispam = antispam.replace(arr[i], by[i]); 
		 }
		 
		 if (antispam != thisDay) {
			window.alert("Špatně vyplněný antispam");
			return false;
		 }
	}
		
	var form = document.getElementById("poukaz");
	form.submit();
}