function openWerkblad(theURL,winName,features) {
//alert(getCookie("werkblad"));
if (getCookie("werkblad")==null || getCookie("werkblad")=="dicht") {
	setCookie("werkblad", "open");
	WinWerk=window.open(theURL,winName,features);
	WinWerk.moveTo(535,280);
	document.location.href="opdracht-bron.php?nr="+theURL.charAt(theURL.length-1)+"&bronnr=1";
	}
	else popupWerkblad(theURL,winName,features);
}

function popupWerkblad(theURL,winName,features) { 
WinWerk=window.open('','werkblad');
WinWerk.focus();
}

function setCookie(cookieName,cookieValue,nDays) {
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString();
}

function getCookie(name)
{
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1)
    {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else
    {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
    {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}