/**********************************************************************
Make an AJAX request and return the resulting dom
**********************************************************************/
function makeRequest(url, method, parameters, format) {
    method     = method || 'GET';
    parameters = (method == 'POST') ? parameters : null;
    format     = format || 'xml'; //can be 'text' or 'xml'

    xmlHttp.open(method, url, false);

    xmlHttp.send(parameters);

    if (format == 'xml') {
        return xmlHttp.responseXML;
    } else if (format == 'text') {
        return xmlHttp.responseText;
    }
}
/**********************************************************************
Formulier posten via AJAX
**********************************************************************/
if (!window.XMLHttpRequest){ 
    window.XMLHttpRequest = function() { 
        var types = [ 
            'Microsoft.XMLHTTP', 
            'MSXML2.XMLHTTP.5.0', 
            'MSXML2.XMLHTTP.4.0', 
            'MSXML2.XMLHTTP.3.0', 
            'MSXML2.XMLHTTP' 
        ]; 

        for (var i = 0; i < types.length; i++) { 
            try { 
                return new ActiveXObject(types[i]); 
            } 
            catch(e) {} 
        } 

        return undefined; 
    } 
}

function cRequest(){
    
    this.sArgs    = '';
    this.sUrl    = '';
    this.sType    = 'GET';
    var xmlhttp    = new XMLHttpRequest(); 
    
    
    this.addArgument = function (name, value){
        this.sArgs += escape(name) + '=' + escape(value) + '&';
    };
    
    this.clearArguments = function(){
        this.sArgs = '';
    };
    
    this.getContent = function(){
                
        if (this.sType.toUpperCase() == 'POST'){
            xmlhttp.open('POST', this.sUrl, false);
            xmlhttp.setRequestHeader('Content-type',    'application/x-www-form-urlencoded');    
            xmlhttp.setRequestHeader('Content-length',    this.sArgs.length);    
            xmlhttp.setRequestHeader('Connection',        'close');    
            xmlhttp.send(this.sArgs);
        } else {                    
            xmlhttp.open('GET', this.sUrl + '?' + this.sArgs, false);
            xmlhttp.send(null);            
        }
        this.clearArguments();
        return xmlhttp;
    };    
    
    this.sendForm = function(oForm){
        this.sUrl     = oForm.action;
        this.sType    = oForm.method;

        var aInputs  = oForm.getElementsByTagName('input');    
        for (var i = 0; i < aInputs.length; i++){
            if (aInputs[i].type == 'checkbox' || aInputs[i].type == 'radio'){
                if (aInputs[i].checked){
                    this.addArgument(aInputs[i].name, aInputs[i].value);
                }
            } else {
                this.addArgument(aInputs[i].name, aInputs[i].value);
            }
        }
        var aSelects = oForm.getElementsByTagName('select');
        for (var i = 0; i < aSelects.length; i++){
            for (var j=0; j < aSelects[i].options.length; j++){
                if (aSelects[i].options[j].selected){
                    this.addArgument(aSelects[i].name, aSelects[i].options[j].value);
                }
            }
        }
        var aTextareas  = oForm.getElementsByTagName('textarea');    
        for (var i = 0; i < aTextareas.length; i++){
            this.addArgument(aTextareas[i].name, aTextareas[i].value);
        }        
        return this.getContent();        
    };
}