function makeRequest(url,blockid) {
    var httpRequest;
    if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        httpRequest = new XMLHttpRequest();
        if (httpRequest.overrideMimeType) {
            httpRequest.overrideMimeType('text/xml');
            // See note below about this line
        }
    } 
    else if (window.ActiveXObject) { // IE
        try {
            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        } 
        catch (e) {
            try {
                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
            } 
            catch (e) {}
        }
    }
    if (!httpRequest) {
        alert('Giving up :( Cannot create an XMLHTTP instance');
        return false;
    }

    httpRequest.onreadystatechange = function() { renderHtml(httpRequest,blockid); }
	
    httpRequest.open('GET', url, true);
    httpRequest.send('');
}

function renderHtml(httpRequest,blockid) {
    if (httpRequest.readyState == 4) {
        if (httpRequest.status == 200) {
            if (blockid == ''){
                if(httpRequest.responseText=='registrationerror'){
                    alert('Kaldenavnet er optaget - venligst angiv et andet kaldenavn');
                    document.forms['registrering'].kaldenavn.value='';
                    redalert(document.forms['registrering'].kaldenavn);
                    document.forms['registrering'].kaldenavn.focus();
                }
                if(httpRequest.responseText=='emailexist'){
                    alert('E-mail findes alleredet - venligst angiv en anden e-mail adresse');
                    document.forms['registrering'].email.value='';
                    redalert(document.forms['registrering'].email);
                    document.forms['registrering'].email.focus();
                }                
            } else if (blockid == '---') {
            } else {
                document.getElementById(blockid).innerHTML=httpRequest.responseText;
            }
        } else {
//            alert('There was a problem with the request.');
        }
    }
}