// JavaScript Document

function emailCheck(str,msg,dom) {
		
		//alert("hi");
		emailStr=str;
		
		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)")
            dom.email.select();
			return false

		}

		var user=matchArray[1]

		var domain=matchArray[2]

		if (user.match(userPat)==null) {

		    // user is not valid

			    alert("The Email UserId doesn't seem to be valid.")
                dom.email.focus();  
			    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!") 
                            dom.email.focus();
							return false

				    }

			    }

		    return true

		}

		var domainArray=domain.match(domainPat)

		if (domainArray==null) 
		   {

			alert("The domain name doesn't seem to be valid.")
            dom.email.focus();
		    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.



			   alert("The address must end in a three-letter domain, or two letter country.")
               dom.email.focus(); 
			   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)
               dom.email.focus();
			   return false

		}

		// If we've gotten this far, everything's valid!
	
	return true;

	}