function  check_form()
         {
           if(window.document.myform.Firstname.value=="")
           {
                  alert("Please enter your first name");
                  document.myform.Firstname.focus();
                  return false;
           }
		   if(window.document.myform.Lastname.value=="")
           {
                  alert("Please enter your last name");
                  document.myform.Lastname.focus();
                  return false;
           }
		   if(window.document.myform.Title.value=="")
           {
                  alert("Please specify your job title");
                  document.myform.Title.focus();
                  return false;
           }
		   if(window.document.myform.Companyname.value=="")
           {
                  alert("Please enter your company name");
                  document.myform.Companyname.focus();
                  return false;
           }

	   //验证电子邮件
      if(document.myform.Email.value == null ||document.myform.Email.value == "")
      {
              alert("Please enter your e-mail address!");
              document.myform.Email.focus();
              return false;
      }
      if(!ValidateEmail(document.myform.Email.value))
      {
              alert("Please enter your e-mail address");
              document.myform.Email.focus();
              return false;
      }
		   
           
		    
			if(window.document.myform.Country.value == 0)
			{
			   alert("Please enter your homeland");
               document.myform.Country.focus();
			   return false;
			}
			
            if(window.document.myform.Phonenumber.value =="" )
           {
                 alert("Please enter your phone number");
                 document.myform.Phonenumber.focus();
                 return false;
           }
		   else
		   {
		      
			  var re =/^\d{1,}$/;
			 if(!re.test(document.myform.Phonenumber.value))
			  {
			      alert("Please enter a valid phone number");
                  document.myform.Phonenumber.focus();
                     return false;
			  }
			  
		   }
		   
		  if(window.document.myform.InterestThing.value =="")
           {
                  alert("Please indicate your interest in us");
                  document.myform.InterestThing.focus();
                  return false;
           }
		   
		   
		   if(window.document.myform.Industry.value == 0)
		   {
		      alert("Please indicate your industry");
              document.myform.Industry.focus();
              return false;
		   }
		   
		   if(window.document.myform.Describ.value == 0)
		   {
		      alert("Please enter the best description of you");
              document.myform.Describ.focus();
              return false;
		   }
		   return true;
		   
	}

	function ValidateEmail(email)
         {
            var re=/^[\w.-]+@([0-9a-z][\w-]+\.)+[a-z]{2,3}$/i;
            if(re.test(email))
            return true;
            else
            return false;
         }