function check()   
  {       
  
  if   (form1.name.value.length==0)   
  {   
  alert("please input your name");   
  form1.name.focus();   
  return   false;   
  }   
  
   if   (form1.email.value.length==0)   
  {   
  alert("please input your E-mail Address");   
  form1.email.focus();   
  return   false;   
  }  
    
	var reg=/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;
var flag=reg.test(form1.email.value);  
if(!flag){
alert("your email is wrong,check please!");
form1.email.focus();   
  return   false; }  
  
  if   (form1.phone.value.length==0)   
  {   
  alert("please input your phone");   
  form1.phone.focus();   
  return   false;   
  }   
  
    if   (form1.message.value.length==0)   
  {   
  alert("please input your feedback");   
  form1.message.focus();   
  return   false;   
  }    
  
  return   true;   
  }