function ShowHide(elem) {
	var x = document.getElementById(elem).style;
	x.display = (x.display == 'block') ? 'none' : 'block';
}

function storeInfo(naam,inhoud) {
	pathname = location.pathname;
	myDomain = pathname.substring(0,pathname.lastIndexOf('/')) +'/';
	var today = new Date;
	var expdate = new Date;
	// 100 dagen
	expdate.setTime(today.getTime() + (100 * 24 * 3600 * 1000));
	SetCookie(naam,inhoud,expdate,myDomain);
}

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 getCookieVal(offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1) endstr = document.cookie.length;
	return unescape (document.cookie.substring(offset, endstr));
}
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 bookmarksite(title, url) {
	if (window.sidebar) {
		window.sidebar.addPanel(title, url, "");
	} else if(window.opera && window.print) {
		var elem = document.createElement('a');
		elem.setAttribute('href',url);
		elem.setAttribute('title',title);
		elem.setAttribute('rel','sidebar');
		elem.click();
	} else if(document.all) {
		window.external.AddFavorite(url, title);
	}
}


function checklinkpartnerform() {
	var errors = '';
	if (val('title').length == 0) errors += '- Vul de titel in\n';
	if (val('linkurl').length == 0) errors += '- Vul de url in\n';
	if (!emailCheck(val('emailaddress'))) errors += '- Vul een correct e-mailadres in\n';
	if (val('security').length == 0) errors += '- Neem de cijfers over uit het plaatje\n';
	
	if (errors == '') {
		return true;
	} 
	else {
		alert('Je hebt niet alles (goed) ingevuld!\n\n'+errors);
		return false;
	}
}

function val(i) {
	return document.getElementById(i).value;
}



/* EMAIL VALIDATION SCRIPT */
		
		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;
		}
		



/* CHECKDATE SCRIPT */
		
		var dtCh= "/";
		var minYear=1900;
		var maxYear=1997;
		
		function isInteger(s){
			var i;
		    for (i = 0; i < s.length; i++){   
		        // Check that current character is number.
		        var c = s.charAt(i);
		        if (((c < "0") || (c > "9"))) return false;
		    }
		    // All characters are numbers.
		    return true;
		}
		
		function stripCharsInBag(s, bag){
			var i;
		    var returnString = "";
		    // Search through string's characters one by one.
		    // If character is not in bag, append to returnString.
		    for (i = 0; i < s.length; i++){   
		        var c = s.charAt(i);
		        if (bag.indexOf(c) == -1) returnString += c;
		    }
		    return returnString;
		}
		
		function daysInFebruary (year){
			// February has 29 days in any year evenly divisible by four,
		    // EXCEPT for centurial years which are not also divisible by 400.
		    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
		}
		function DaysArray(n) {
			for (var i = 1; i <= n; i++) {
				this[i] = 31
				if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
				if (i==2) {this[i] = 29}
		   } 
		   return this
		}
		
		function isDate(dtStr){
			var daysInMonth = DaysArray(12)
			var pos1=dtStr.indexOf(dtCh)
			var pos2=dtStr.indexOf(dtCh,pos1+1)
			var strMonth=dtStr.substring(pos1+1,pos2)
			var strDay=dtStr.substring(0,pos1)
			var strYear=dtStr.substring(pos2+1)
			strYr=strYear
			if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
			if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
			for (var i = 1; i <= 3; i++) {
				if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
			}
			month=parseInt(strMonth)
			day=parseInt(strDay)
			year=parseInt(strYr)
			if (pos1==-1 || pos2==-1){
				//alert("The date format should be : dd/mm/yyyy")
				return false
			}
			if (strMonth.length<1 || month<1 || month>12){
				//alert("Please enter a valid month")
				return false
			}
			if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
				//alert("Please enter a valid day")
				return false
			}
			if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
				//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
				return false
			}
			if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
				//alert("Please enter a valid date")
				return false
			}
		return true
		}