function emailCheck (email) {
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=email.match(emailPat);
if (matchArray==null) {
	document.getElementById('email_error').style.display='block';
	document.getElementById('email_error').innerHTML="email address seems incorrect (check @ and .'s)";
	return false;
}
var user=matchArray[1];
var domain=matchArray[2];
if (user.match(userPat)==null) {
	document.getElementById('email_error').style.display='block';
	document.getElementById('email_error').innerHTML="The username doesn't seem to be valid.";
    return false;
}
var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
			document.getElementById('email_error').style.display='block';
			document.getElementById('email_error').innerHTML="Destination IP address is invalid!";
		return false;
	    }
    }
    return true;
}
var domainArray=domain.match(domainPat);
if (domainArray==null) {
	document.getElementById('email_error').style.display='block';
	document.getElementById('email_error').innerHTML="The domain name doesn't seem to be valid.";
    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) {
	document.getElementById('email_error').style.display='block';
	document.getElementById('email_error').innerHTML="The address must end in a three-letter domain, or two letter country.";
   return false;
}
if (len<2) {
   	var errStr="This address is missing a hostname!";
   	document.getElementById('email_error').style.display='block';
	document.getElementById('email_error').innerHTML=errStr;
   return false;
}
return true;
}

function chksubscribefrm(frm)
{
	var count=0;

	if(frm.subscribeusername.value=='')
	{
		document.getElementById('username_error').style.display='block';
		document.getElementById('username_error').innerHTML='Name Can not be Blank';
		count++;
	}
	else
	{
		document.getElementById('username_error').style.display='none';
	}
	
	if(frm.subscribeemail.value=='')
	{
		document.getElementById('email_error').style.display='block';
		document.getElementById('email_error').innerHTML='Email Can not be Blank';
		count++;
	}
	else
	{
		document.getElementById('email_error').style.display='none';
	}
	
	if(frm.subscribeemail.value!="")
  	{
		if (!emailCheck(frm.subscribeemail.value) )
		{
			 count++;
		}
	}
	
	if(count>0)
	{
		return false;	
	}
	
return true;	
}