function isValidEmail(a_sEmail, field)
{
   if (a_sEmail != null && a_sEmail != "")
   {
      /* The following pattern is used to check if the entered e-mail address
         fits the user@domain format.  It also is used to separate the username
         from the domain. */
      var emailPat=/^(.+)@(.+)$/;
      /* The following string represents the pattern for matching all special
         characters.  We don't want to allow special characters in the address.
         These characters include ( ) < > @ , ; : \ " . [ ]    */
      var specialCharsUser="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
      var specialCharsDomain="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]\\'";
      /* The following string represents the range of characters allowed in a
         username or domainname.  It really states which chars aren't allowed. */
      var validCharsUser="\[^\\s" + specialCharsUser + "\]";
      var validCharsDomain="\[^\\s" + specialCharsDomain + "\]";
      /* The following pattern applies if the "user" is a quoted string (in
         which case, there are no rules about which characters are allowed
         and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
         is a legal e-mail address. */
      var quotedUser="(\"[^\"]*\")";
      /* The following pattern applies for domains that are IP addresses,
         rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
         e-mail address. NOTE: The square brackets are required. */
      var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
      /* The following string represents an atom (basically a series of
         non-special characters.) */
      var atomUser=validCharsUser + '+';
      var atomDomain=validCharsDomain + '+';
      /* The following string represents one word in the typical username.
         For example, in john.doe@somewhere.com, john and doe are words.
         Basically, a word is either an atom or quoted string. */
      var wordUser="(" + atomUser + "|" + quotedUser + ")";
      // The following pattern describes the structure of the user
      var userPat=new RegExp("^" + wordUser + "(\\." + wordUser + ")*$");
      /* The following pattern describes the structure of a normal symbolic
         domain, as opposed to ipDomainPat, shown above. */
      var domainPat=new RegExp("^" + atomDomain + "(\\." + atomDomain +")*$");

      /* Finally, let's start trying to figure out if the supplied address is
         valid. */

      /* Begin with the coarse pattern to simply break up user@domain into
         different pieces that are easy to analyze. */
      var matchArray=a_sEmail.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. */
       callAlertWithField("The format of the email address you entered is not valid for email addresses.", field);
       return false;
      }
      var user=matchArray[1];
      var domain=matchArray[2];
      // See if "user" is valid
      if (user.match(userPat)==null)
      {
          // user is not valid
          callAlertWithField("Email username doesn't seem to be valid.", field);
          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)
             {
               callAlertWithField("Email IP address is invalid!", field);
             return false;
           }
          }
          return true;
      }

      // Domain is symbolic name
      var domainArray=domain.match(domainPat);
      if (domainArray==null)
      {
       callAlertWithField("Email domain name doesn't seem to be valid.", field);
         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(atomDomain,"g");
      var domArr=domain.match(atomPat);
      var len=domArr.length;
      var topDomain = domArr[domArr.length-1];
      if ( topDomain.length<2 ) // the address must be greater than 1 char
      {
         callAlertWithField("Email address must end in a domain greater than 1 character.", field);
         return false;
      }

      // Make sure there's a host name preceding the domain.
      if (len<2)
      {
         var errStr="Email address is missing a hostname.";
         callAlertWithField(errStr, field);
         return false;
      }
   } else {
	callAlertWithField("Email Field Cannot Be empty.", "#email_address_field");
	return false
	}
   // If we've gotten this far, everything's valid!
   return true;
}

function callAlertWithField(alertMessage, field)
{

	$(field).css({"border": "1px solid red"})
	if("#alert_message_"+$(field).attr("id")){
		$("#alert_message_"+$(field).attr("id")).html(alertMessage);
	}
}

$(function() {
	$("#email_signup").bind("submit", {}, function(evt) {
		if (isValidEmail($("#email_address_field").val(),"#email_address_field"))
			{
				
			} else {
				event.preventDefault();		
				
			}
	})
})