function IsValidEmail (emailStr) {
  /* 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 specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
  /* The following string represents the range of characters allowed in a 
    username or domainname.  It really states which chars aren't allowed. */
  var validChars="\[^\\s" + specialChars + "\]"
  /* 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=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
  /* The following string represents an atom (basically a series of
    non-special characters.) */
  var atom=validChars + '+'
  /* The following string represents one word in the typical username.
    For example, in john.doe@somewhere.com, john and doe are words.
    Basically, a word is either an atom or quoted string. */
  var word="(" + atom + "|" + quotedUser + ")"
  // The following pattern describes the structure of the user
  var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
  /* The following pattern describes the structure of a normal symbolic
    domain, as opposed to ipDomainPat, shown above. */
  var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


  /* 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=emailStr.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. */
	  alert("Email address seems incorrect (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("The username doesn't seem to be valid.")
      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("The domain name doesn't seem to be valid.")
      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(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.")
    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)
    return false
  }

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


function swichCheck(root, max) {
	element = "document.forms[0]." + root;
	box = eval(element);
	state = box.checked;
	for (i=0; i < max; i++) {
		element = "document.forms[0]." + root + i;
		box = eval(element);
		box.checked = state;
	}
}

function checkSetAll(root, max) {
	element = "document.forms[0]." + root;
	for (i=0; i < max; i++) {
		element = "document.forms[0]." + root + i;
		box = eval(element);
		box.checked = true;
	}
}

function checkUnsetAll(root, max) {
	element = "document.forms[0]." + root;
	for (i=0; i < max; i++) {
		element = "document.forms[0]." + root + i;
		box = eval(element);
		box.checked = false;
	}
}


function JrecImageWindow(mypage, myname, w, h, scroll) {
	winl = (screen.width - w) / 2;
	wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
	win = window.open(mypage, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) { 
		win.window.focus(); 
	}
}



function CheckTerms(checkBoxName) {
	if (document.getElementById(checkBoxName).checked) {
		return true; 
	} else {
		alert("Please check the box: I have read and accept the terms and conditions of the IEA to continue.");
		return false;
	}
}