function emovoegin(code) {
var cache = document.recensieform.recensie.value;
this.code = code;
document.recensieform.recensie.value = cache + code;
document.recensieform.recensie.focus();
}

function clearText(field){
if (field.defaultValue == field.value) field.value = '';
else if (field.value == '') field.value = field.defaultValue;
}

function getXMLHTTP() { //fuction to return the xml http object
                var xmlhttp=false;
                try{
                        xmlhttp=new XMLHttpRequest();
                }
                catch(e)        {
                        try{
                                xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch(e){
                                try{
                                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
                                }
                                catch(e1){
                                        xmlhttp=false;
                                }
                        }
                }

                return xmlhttp;
    }

        function vindland(continentId) {

                var strURL="vindland.php?continent="+continentId;
                var req = getXMLHTTP();

                document.auteurinput.geboorteplaats.options.length=0;
                document.auteurinput.geboorteplaats.options[0]=new Option("-", "-", true, false);

                if (req) {

                        req.onreadystatechange = function() {
                                if (req.readyState == 4) {
                                        // only if "OK"
                                        if (req.status == 200) {
                                                document.getElementById('spanland').innerHTML=req.responseText;

                                        } else {
                                                alert("There was a problem while using XMLHTTP:\n" + req.statusText);
                                        }
                                }
                        }
                        req.open("GET", strURL, true);
                        req.send(null);
                }
        }
        function vindplaats(continentId,landId) {
                var strURL="vindplaats.php?continent="+continentId+"&land="+landId;
                var req = getXMLHTTP();

                if (req) {

                        req.onreadystatechange = function() {
                                if (req.readyState == 4) {
                                        // only if "OK"
                                        if (req.status == 200) {
                                                document.getElementById('spanstad').innerHTML=req.responseText;
                                        } else {
                                                alert("There was a problem while using XMLHTTP:\n" + req.statusText);
                                        }
                                }
                        }
                        req.open("GET", strURL, true);
                        req.send(null);
                }

        }
        function vindland2(continentId) {

                var strURL="vindland2.php?continent="+continentId;
                var req = getXMLHTTP();

                document.auteurinput.overlijdensplaats.options.length=0;
                document.auteurinput.overlijdensplaats.options[0]=new Option("-", "-", true, false);

                if (req) {

                        req.onreadystatechange = function() {
                                if (req.readyState == 4) {
                                        // only if "OK"
                                        if (req.status == 200) {
                                                document.getElementById('spanland2').innerHTML=req.responseText;

                                        } else {
                                                alert("There was a problem while using XMLHTTP:\n" + req.statusText);
                                        }
                                }
                        }
                        req.open("GET", strURL, true);
                        req.send(null);
                }
        }
        function vindplaats2(continentId,landId) {
                var strURL="vindplaats2.php?continent="+continentId+"&land="+landId;
                var req = getXMLHTTP();

                if (req) {

                        req.onreadystatechange = function() {
                                if (req.readyState == 4) {
                                        // only if "OK"
                                        if (req.status == 200) {
                                                document.getElementById('spanstad2').innerHTML=req.responseText;
                                        } else {
                                                alert("There was a problem while using XMLHTTP:\n" + req.statusText);
                                        }
                                }
                        }
                        req.open("GET", strURL, true);
                        req.send(null);
                }

        }