var slideDownInitHeight = new Array();
  var slidedown_direction = new Array();

  var slidedownActive = false;
  var contentHeight = false;
  var slidedownSpeed = 6; 	// Higher value = faster script
  var slidedownTimer = 11;	// Lower value = faster script
  function slidedown_showHide(boxId)
  {
  if(!slidedown_direction[boxId])slidedown_direction[boxId] = 1;
  if(!slideDownInitHeight[boxId])slideDownInitHeight[boxId] = 0;
  if(slideDownInitHeight[boxId]==0)slidedown_direction[boxId]=slidedownSpeed; else slidedown_direction[boxId] = slidedownSpeed*-1;
  
  slidedownContentBox = document.getElementById(boxId);
  var subDivs = slidedownContentBox.getElementsByTagName('DIV');
  for(var no=0;no<subDivs.length;no++){
  
  if(subDivs[no].className=='dhtmlgoodies_content')slidedownContent = subDivs[no];	

  }

  contentHeight = slidedownContent.offsetHeight;
	
  slidedownContentBox.style.visibility='visible';
  slidedownActive = true;
  slidedown_showHide_start(slidedownContentBox,slidedownContent);
  }
  function slidedown_showHide_start(slidedownContentBox,slidedownContent)
  {

  if(!slidedownActive)return;
  slideDownInitHeight[slidedownContentBox.id] = slideDownInitHeight[slidedownContentBox.id]/1 + slidedown_direction[slidedownContentBox.id];
  if(slideDownInitHeight[slidedownContentBox.id] <= 0){
  slidedownActive = false;	
  slidedownContentBox.style.visibility='hidden';
  slideDownInitHeight[slidedownContentBox.id] = 0;
  }
  if(slideDownInitHeight[slidedownContentBox.id]>contentHeight){
  slidedownActive = false;	
  }
  slidedownContentBox.style.height = slideDownInitHeight[slidedownContentBox.id] + 'px';
  slidedownContent.style.top = slideDownInitHeight[slidedownContentBox.id] - contentHeight + 'px';
  setTimeout('slidedown_showHide_start(document.getElementById("' + slidedownContentBox.id + '"),document.getElementById("' + slidedownContent.id + '"))',slidedownTimer);	// Choose a lower value than 10 to make the script move faster
  }
	
  function setSlideDownSpeed(newSpeed)
  {
  slidedownSpeed = newSpeed;
		
  }
  
  
  
  
function emailCheck (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;
}

if (len<2) {
   //var errStr="This address is missing a hostname!"
   return false;
}
return true;
}