// JavaScript Document
function checksubmit(){
 var name=document.getElementById("name").value;
  if (name==null || name==""){
	name_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 此项为必填项。</font></td></tr></table>";
  document.getElementById("name").focus();
  return false;
  }
  else {
    name_div.innerHTML="";
  }
 var phone=document.getElementById("phone").value;
   if (phone==null || phone==""){
	  phone_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 此项为必填项。</font></td></tr></table>";
   document.getElementById("phone").focus();
   return false;
   }
   else{
    phone_div.innerHTML="";
  }
  	   if (phone.length!=11){
	       phone_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 请输入有效的手机号码。</font></td></tr></table>";
		   document.getElementById("phone").focus();
		   return false;
	   }
	   else{
	       phone_div.innerHTML="";
	   }
	   var myreg = /^(((13[0-9]{1})|159|153)+\d{8})$/;
       if (!phone.match(myreg) && phone!=""){
	        phone_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 请输入有效的手机号码。</font></td></tr></table>";
		   document.getElementById("phone").focus();
		   return false;
	   }
	   else{
	       phone_div.innerHTML="";
	   }
	var Email=document.getElementById("Email").value;
	if (Email==null || Email==""){
		Email_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 此项为必填项。</font></td></tr></table>";
	document.getElementById("Email").focus();
	return false;
	}
	else{
	    Email_div.innerHTML="";
	}
   var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;
	 if (!Email.match(reg) && Email!=""){
		 Email_div.innerHTML="<table><tr><td><img src='images/reg_alert.jpg'></td><td><font color='red'> 邮箱地址格式错误或含有非法字符!</font></td></tr></table>";
	document.getElementById("Email").focus();
	return false;
	 }
	 else{
	       Email_div.innerHTML="";
	 }
}