function checkConference(chkForm,lang_e) {
    var z = 0;
    var rtnBool = false;
    for(z=0; z<chkForm.length;z++){
        if(chkForm[z].type == 'checkbox'){
            if (chkForm[z].checked && chkForm[z].disabled==false) {
                rtnBool = true;
            }
        }
    }
    if (rtnBool==false) {
        if (lang_e==''||lang_e=="en") {
            alert("Please select at least one conference");
        } else {
            alert("請選擇最少一個會議");
        }
    } else {
        document.getElementById("p_code").disabled=false;
    }
    return rtnBool;
}
	
function en_others(chkBox, txtBox) {
    if (document.getElementById(chkBox).checked==true) {
        document.getElementById(txtBox).disabled=false;
        document.getElementById(txtBox).focus();
    } else {
        document.getElementById(txtBox).disabled=true;
        document.getElementById(txtBox).value="";
    }
}
	
function en_region(boolean_en) {
    document.getElementById('q3_01').disabled=boolean_en;
    document.getElementById('q3_02').disabled=boolean_en;
    document.getElementById('q3_03').disabled=boolean_en;
    document.getElementById('q3_04').disabled=boolean_en;
    document.getElementById('q3_05').disabled=boolean_en;
    document.getElementById('q3_06').disabled=boolean_en;
    document.getElementById('q3_07').disabled=boolean_en;
    document.getElementById('q3_08').disabled=boolean_en;
    document.getElementById('q3_09').disabled=boolean_en;
    document.getElementById('q3_10').disabled=boolean_en;
    document.getElementById('q3_11').disabled=boolean_en;
    document.getElementById('q3_12').disabled=boolean_en;
    document.getElementById('q8_01').disabled=boolean_en;
    document.getElementById('q8_02').disabled=boolean_en;
    document.getElementById('q8_03').disabled=boolean_en;
    document.getElementById('q8_04').disabled=boolean_en;
    document.getElementById('q8_05').disabled=boolean_en;
    if (boolean_en==true) {
        document.getElementById('q3_01').checked=false
        document.getElementById('q3_02').checked=false
        document.getElementById('q3_03').checked=false
        document.getElementById('q3_04').checked=false
        document.getElementById('q3_05').checked=false
        document.getElementById('q3_06').checked=false
        document.getElementById('q3_07').checked=false
        document.getElementById('q3_08').checked=false
        document.getElementById('q3_09').checked=false
        document.getElementById('q3_10').checked=false
        document.getElementById('q3_11').checked=false
        document.getElementById('q3_12').checked=false
        document.getElementById('q8_01').checked=false
        document.getElementById('q8_02').checked=false
        document.getElementById('q8_03').checked=false
        document.getElementById('q8_04').checked=false
        document.getElementById('q8_05').checked=false
        document.getElementById('q8_other').disabled=boolean_en;
        document.getElementById('q8_other').value='';
    }
}

function chkBoxCheck(chkBox) {
    if (chkBox=="NA100" && document.getElementById(chkBox).checked==true) {
        if (document.getElementById("NA102").disabled==false) {
            if (document.getElementById("NA102").checked==true) {
                document.getElementById("NA102").checked=false;
            }
        } else {
            if(document.getElementById("NA102").checked==true){
                document.getElementById("NA100").checked=false;
            }
        }

    }
    if (chkBox=="NA102" && document.getElementById(chkBox).checked==true) {
        if (document.getElementById("NA100").disabled==false) {
            if (document.getElementById("NA100").checked==true) {
                document.getElementById("NA100").checked=false;
            }
        } else {
            if(document.getElementById("NA100").checked==true){
                document.getElementById("NA102").checked=false;
            }
        }
    }
    if (chkBox=="NA103" && document.getElementById(chkBox).checked==true) {
        if (document.getElementById("NA104").disabled==false) {
            if (document.getElementById("NA104").checked==true) {
                document.getElementById("NA104").checked=false;
            }
        } else {
            if(document.getElementById("NA104").checked==true){
                document.getElementById("NA103").checked=false;
            }
        }
    }
    if (chkBox=="NA104" && document.getElementById(chkBox).checked==true) {
        if (document.getElementById("NA103").disabled==false) {
            if (document.getElementById("NA103").checked==true) {
                document.getElementById("NA103").checked=false;
            }
        } else {
            if(document.getElementById("NA103").checked==true){
                document.getElementById("NA104").checked=false;
            }
        }
    }
}

function getPromoCode(lang_e) {
    var p_id;
    p_id = document.getElementById("p_code").value;
    if (p_id!="") {
        var url;
        url = "getPromoCode.php?p_id="+p_id;
        var xmlHttp;
        try {
            // Firefox, Opera 8.0+, Safari
            xmlHttp=new XMLHttpRequest();
        } catch (e) {
            // Internet Explorer
            try {
                xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (e) {
                    alert("Your browser does not support AJAX!");
                    return false;
                }
            }
        }
        xmlHttp.onreadystatechange=function() {
            if(xmlHttp.readyState==4) {
                var strResult = xmlHttp.responseText;
                if (strResult!="") {
                    if (strResult=="N") {
                        if (lang_e=="en") {
                            alert("No quota left for the code you entered.");
                        } else {
                            alert("閣下的參展商折扣碼已無效");
                        }
                        document.getElementById("p_code").value="";
                        document.getElementById("p_discount").value="0";
                    } else {
                        if (lang_e=="en") {
                            alert("You will enjoy special discount.");
                        } else {
                            alert("閣下可享有參展商特別折扣");
                        }
                        document.getElementById("p_code").disabled=true;
                        document.getElementById("getprice").disabled=true;
                        document.getElementById("p_discount").value=strResult;
                    }
                } else {
                    if (lang_e=="en") {
                        alert("Invalid exhibitor rate promotional code!");
                    } else {
                        alert("錯誤參展商折扣碼，請輸入正確折扣碼");
                    }
                    document.getElementById("p_code").value="";
                    document.getElementById("p_discount").value="0";
                }
            }
        }
        xmlHttp.open("GET",url,true);
        xmlHttp.send(null);
    } else {
        if (lang_e=="en") {
            alert("Please type the exhibitor rate promotional code.");
        } else {
            alert("請輸入參展商折扣碼");
        }
    }
}