function popup(url,name,width,height,resizable,scrollbars) 
{
	var str = "width=" + width + ",height=" + height;
	str += ",resizable=" + resizable + ",scrollbars=" + scrollbars;
	
	if (window.screen)
	{
		var ah = screen.availHeight - 30;
		var aw = screen.availWidth - 10;
	
	    var xc = (aw - width) / 2;
		var yc = (ah - height) / 2;
	
		str += ",left=" + xc + ",screenX=" + xc;
	    str += ",top=" + yc + ",screenY=" + yc;
	}
	
	return window.open(url, name, str);
}

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
	}

	// 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 conditional_popup(url,name,width,height,resizable,scrollbars,cookiename,expDays)
{
	var count = GetCookie(cookiename);
	var exp = new Date(); 
	exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

	if (count == null) 
	{
		count=1;
		SetCookie(cookiename, count, exp);
		
		var str = "width=" + width + ",height=" + height;
		str += ",resizable=" + resizable + ",scrollbars=" + scrollbars;
		
		if (window.screen)
		{
			var ah = screen.availHeight - 30;
			var aw = screen.availWidth - 10;
	
			var xc = (aw - width) / 2;
			var yc = (ah - height) / 2;
	
			str += ",left=" + xc + ",screenX=" + xc;
			str += ",top=" + yc + ",screenY=" + yc;
		}
		
		return window.open(url, name, str);
	}
	else 
	{
		count++;
		SetCookie(cookiename, count, exp);
	}
}

function GetCookie(name)
{  
	var arg = name + "=";  
	var alen = arg.length;  
	var clen = document.cookie.length;  
	var i = 0;  
	while (i < clen)
	{    
		var j = i + alen;    
		if (document.cookie.substring(i, j) == arg) return getCookieVal (j);    
		i = document.cookie.indexOf(" ", i) + 1;    
		if (i == 0) break;   
	}  
	return null;
}

function SetCookie(name, value)
{  
	var argv = SetCookie.arguments;  
	var argc = SetCookie.arguments.length;  
	var expires = (argc > 2) ? argv[2] : null;  
	var path = (argc > 3) ? argv[3] : null;  
	var domain = (argc > 4) ? argv[4] : null;  
	var secure = (argc > 5) ? argv[5] : false;  
	document.cookie = name + "=" + escape (value) + 
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
	((path == null) ? "" : ("; path=" + path)) +  
	((domain == null) ? "" : ("; domain=" + domain)) +    
	((secure == true) ? "; secure" : "");
}

function DeleteCookie(name) 
{  
	var exp = new Date();  
	exp.setTime (exp.getTime() - 1);  
	var cval = GetCookie (name);  
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

function amt()
{
	var count = GetCookie('count')
	if(count == null) 
	{
		SetCookie('count','1')
		return 1
	}
	else 
	{
		var newcount = parseInt(count) + 1;
		DeleteCookie('count')
		SetCookie('count',newcount,exp)
		return count
   }
}

function getCookieVal(offset)
{
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1) endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}