function emailOk(emailAddr) {
        var i;
        i = emailAddr.indexOf("@");
        if (i == -1) {
                return false;
        }
        var username = emailAddr.substring(0, i);
        var domain = emailAddr.substring(i + 1, emailAddr.length)
        i = 0;
        while ((username.substring(i, i + 1) == " ") && (i < username.length)) {
                i++;
        }
        if (i > 0) {
                username = username.substring(i, username.length);
        }
        i = domain.length - 1;
        while ((domain.substring(i, i + 1) == " ") && (i >= 0)) {
                i--;
        }
        if (i < (domain.length - 1)) {
                domain = domain.substring(0, i + 1);
        }
        if ((username == "") || (domain == "")) {
                return false;
        }
        var ch;
        for (i = 0; i < username.length; i++) {
                ch = (username.substring(i, i + 1)).toLowerCase();
                if (!(((ch >= "a") && (ch <= "z")) ||
                        ((ch >= "0") && (ch <= "9")) ||
                        (ch == "_") || (ch == "-") || (ch == "."))) {
                                return false;
                }
        }

        for (i = 0; i < domain.length; i++) {
                ch = (domain.substring(i, i + 1)).toLowerCase();
                if (!(((ch >= "a") && (ch <= "z")) ||
                        ((ch >= "0") && (ch <= "9")) ||
                        (ch == "_") || (ch == "-") || (ch == "."))) {
                                return false;
                }
        }
        i = domain.indexOf(".");
        if (i == -1) {
                return false;
        }
        return true;
};

function validate(form){
    good = true;
    err = "Грешно въведени данни:\n\n";

	if (document.getElementsByName("subject").length){
		if (form.subject.value==''){
			good=false;
			err+="Тема\n";
		};
	}

	if (document.getElementsByName("name").length){
		if (form.name.value==''){
			good=false;
			err+="Име\n";
		};
	}

	if (document.getElementsByName("email").length){
		if (!emailOk(form.email.value)){
			good=false;
			err+="E-mail\n";
		};
	}
	if (document.getElementsByName("message").length){
		if (form.message.value==''){
			good=false;
			err+="Съобщение\n";
		};
	}

	err += "\nМоля, коригирайте ги и опитайте отново.\n";

    if (!good) {
        alert(err);
    }else{
        exit=false;
    }

    if(good) form.submit();
}