function compulsory(a){missinginfo="";if(document.invitation_form.i_name.value==""){if(a=="sc"){missinginfo+="请填写你的姓名<br>"}else if(a=="tc"){missinginfo+="請填寫你的姓名<br>"}else{missinginfo+="Your name is required <br>"}}if(document.invitation_form.i_email.value==""){if(a=="sc"){missinginfo+="请填写你的电邮地址 <br>"}else if(a=="tc"){missinginfo+="請填寫你的電郵地址 <br>"}else{missinginfo+="Your email is required <br>"}}if(document.invitation_form.r_name.value==""){if(a=="sc"){missinginfo+="请填写你朋友的名称 <br>"}else if(a=="tc"){missinginfo+="請填寫你朋友的名稱 <br>"}else{missinginfo+="Your friend's name is required <br>"}}if(document.invitation_form.r_email.value==""){if(a=="sc"){missinginfo+="请填写你朋友的电邮地址 <br>"}else if(a=="tc"){missinginfo+="請填寫你朋友的電郵地址 <br>"}else{missinginfo+="Your friend's email is required <br>"}}if(missinginfo!=""){document.getElementById("i_text").innerHTML=missinginfo;return false}else{missinginfo="";if(!checkEmail(document.invitation_form.i_email.value)){if(a=="sc"){missinginfo+="你的电邮地址并不正确 <br>"}else if(a=="tc"){missinginfo+="你的電郵地址並不正確 <br>"}else{missinginfo+="Your email is not a valid email <br>"}}if(!checkEmail(document.invitation_form.r_email.value)){if(a=="sc"){missinginfo+="你朋友的电邮地址并不正确 <br>"}else if(a=="tc"){missinginfo+="你朋友的電郵地址並不正確 <br>"}else{missinginfo+="Your friend's email is not a valid email <br>"}}if(missinginfo!=""){document.getElementById("i_text").innerHTML=missinginfo;return false}else{return true}}}function compulsory_contact(a){missinginfo="";if(document.contact_form.surname.value==""){if(a=="sc"){missinginfo+="请填写你的姓<br>"}else if(a=="tc"){missinginfo+="請填寫你的姓<br>"}else{missinginfo+="Your surname is required <br>"}}if(document.contact_form.firstname.value==""){if(a=="sc"){missinginfo+="请填写你的名称<br>"}else if(a=="tc"){missinginfo+="請填寫你的名稱<br>"}else{missinginfo+="Your given name is required <br>"}}if(document.contact_form.phone.value==""){if(a=="sc"){missinginfo+="请填写你的电话号码<br>"}else if(a=="tc"){missinginfo+="請填寫你的電話號碼<br>"}else{missinginfo+="Your phone is required <br>"}}if(document.contact_form.email.value==""){if(a=="sc"){missinginfo+="请填写你的电邮地址<br>"}else if(a=="tc"){missinginfo+="請填寫你的電郵地址<br>"}else{missinginfo+="Your email is required <br>"}}if(document.contact_form.company.value==""){if(a=="sc"){missinginfo+="请填写你的公司名称<br>"}else if(a=="tc"){missinginfo+="請填寫你的公司名稱<br>"}else{missinginfo+="Your company name is required <br>"}}if(document.contact_form.address.value==""){if(a=="sc"){missinginfo+="请填写你的地址<br>"}else if(a=="tc"){missinginfo+="請填寫你的地址<br>"}else{missinginfo+="Your address is required <br>"}}if(document.contact_form.enquiry.value==""){if(a=="sc"){missinginfo+="请填写你的查询<br>"}else if(a=="tc"){missinginfo+="請填寫你的查詢<br>"}else{missinginfo+="Please input your enquiry<br>"}}if(missinginfo!=""){document.getElementById("i_text").innerHTML=missinginfo;return false}else{missinginfo="";if(!checkEmail(document.contact_form.email.value)){if(a=="sc"){missinginfo+="你的电邮地址并不正确 <br>"}else if(a=="tc"){missinginfo+="你的電郵地址並不正確 <br>"}else{missinginfo+="Your email is not a valid email <br>"}}if(missinginfo!=""){document.getElementById("i_text").innerHTML=missinginfo;return false}else{return true}}}function validate_num(a){var b="0123456789- ";var c;for(var d=0;d<a.length;d++){c=a.substring(d,d+1);if(b.indexOf(c)==-1){return false}}return true}function checkEmail(a){if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(a)){return true}}