// This script and many more are available free online at
		// The JavaScript Source!! http://javascript.internet.com
		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("Please enter a valid email address (check @ and .'s)")
				return false
			}
			var user=matchArray[1]
			var domain=matchArray[2]
	
			// See if "user" is valid
			if (user.match(userPat)==null) {
				// user is not valid
				alert("Please enter a valid email address.")
				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) {
						alert("Destination IP address is invalid!")
					return false
					}
				}
				return true
			}
	
			// Domain is symbolic name
			var domainArray=domain.match(domainPat)
			if (domainArray==null) {
				alert("Please enter a valid email address.")
				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) {
			   alert("Please enter a valid email address.")
			   return false
			}
	
			if (len<2) {
			   var errStr="Please enter a valid email address."
			   alert(errStr)
			   return false
			}
	
			return true;
		}