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) {
	  	//alert("Email address seems incorrect (check @ and .'s)")
	  	alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	
	if (user.match(userPat)==null) {
	    // user is not valid
	    //alert("The username doesn't seem to be valid.")
	    alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
	    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) {
		        //alert("Destination IP address is invalid!")
		        alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
			return false
		    }
	    }
	    return true
	}
	
	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		//alert("The domain name doesn't seem to be valid.")
		alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
	    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>6) {
	   // the address must end in a two letter or three letter word.
	   //alert("The address must end in a three-letter domain, or two letter country.")
	   alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
	   return false
	}
	
	// Make sure there's a host name preceding the domain.
	if (len<2) {
	   var errStr="This address is missing a hostname!"
	   //alert(errStr)
	   alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
	   return false
   }
	
	var ch;
	var validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@._-";
	for(var i = 0; i < emailStr.length; i++){
		if(validChars.indexOf(emailStr.charAt(i)) == -1){
			//alert("Please enter a valid email address.");
			alert("The email address you supplied does not appear to be valid.  Please check that the @ symbol and any periods are correctly placed.");
			return false;
		}
	}
	// If we've gotten this far, everything's valid!
	return true;
}
	//  End -->