// JavaScript Document
    function Trim() {
       return this.replace(/\s+$|^\s+/g,"");
    }
    String.prototype.Trim=Trim;
	
    function IsEmpty(his)
    {
       flag = true;
       for(var i=0;i<his.length;i++)
       {
          if(his.charAt(i)!=" ")
          { 
             flag = false; 
             break;
          }
       }
      return flag;
    }

    function emailCheck (emailStr) {
    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 +")*$")
    var matchArray=emailStr.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. */
	  return false
    }
    var user=matchArray[1]
    var domain=matchArray[2]
        // See if "user" is valid 
    if (user.match(userPat)==null) {
       // user is not valid
       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) {
		   return false
	     }
     }
    return true
    }
   // Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    return false
}
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.
   return false
}
// Make sure there's a host name preceding the domain.
if (len<2) {
   return false
}
// If we've gotten this far, everything's valid!
return true;
}