//瑼Ｘ摮葡?臬?箸??
function isNumber( str ){
 	if( str.length == 0 ) return false;
 	for( var loc=0; loc<str.length; loc++ )
 		if( (str.charAt(loc) < '0') || (str.charAt(loc) > '9') ) return false;
 	return true;
}

//?芷摮葡??銋征??
function trim(strText){
  while (strText.substring(0,1) == ' ')
    strText = strText.substring(1, strText.length);
  while (strText.substring(strText.length-1,strText.length) == ' ')
    strText = strText.substring(0, strText.length-1);
  return strText;
}

//check 頛詨甈??臬蝛箇
function chkBlank(obj,Str)
{
  if (obj.value == "")
  {
    alert("please enter your "+Str+"!");
    obj.focus();
    obj.select();
    return false;
  }
  else
    return true;
}

//check 頛詨甈??臬?箸摮?
function chkint(obj,StrField){
     str=obj.value+"";
     for(var i=0;i<str.length; i++){
      if(str.charAt(i)<"0" ||
         str.charAt(i)>"9"){
         alert("Please fill correct "+StrField+" value,must number!");
         obj.focus();
         return false;
      }
     }

     return true;
 }
//check Email頛詨甈??臬甇?Ⅱ
function chkEmail(obj,Str)
{
  var exp_email = /^[a-z][a-z_0-9\.\-]+@[a-z_0-9\.\-]+\.[a-z]{2,3}$/i

  if (!exp_email.test(Str))
  {
    alert("Please enter Correct Email Address !");
    obj.focus();
    obj.select()
    return false;
  }
  else
    return true;
}

//e-mail check 2
function chk_email (mail) {
var e_mail=mail;
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=e_mail.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	alert("Email address incorrect!(Check @ or .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid
if (user.match(userPat)==null) {
    // user is not valid
    alert("The username in your email is invalid.")
    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("Destination IP address in your email is invalid!")
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The domain name in your email is invalid.")
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 ||
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
   alert("The address in your email must end in a three-letter domain, or two letter country.")
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="This email address is missing a hostname!"
   alert(errStr)
   return false
}

   var leng = e_mail.length;

   for(var i=0;i<leng;i++)
   {  var c= e_mail.charAt(i);
      if(!((c>="A"&&c<="Z")||(c>="a"&&c<="z")||(c>="0"&&c<="9")||(c=="-")||(c=="_")||(c==".")||(c=="@"))){
         alert("Your mail address could only be number,English char or '-','_','@'...,can't be any other chars!\n")
   	return false}
   }
// If we've gotten this far, everything's valid!
return true;
}