var http_request = false;

///////////////////////////////////////////////////////////////////
////
///////////////////////////////////////////////////////////////////
function formMakeRequest(url,parameters) {
    http_request = false;

    if (window.XMLHttpRequest) { // Mozilla, Safari,...
	http_request = new XMLHttpRequest();
	if (http_request.overrideMimeType) {
	    // set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
	}
    } else if (window.ActiveXObject) { // IE
	try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
            try {
		http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
	}
    }

    if (!http_request) {
	alert('Cannot create XMLHTTP instance');
	return false;
    }

    http_request.onreadystatechange = alertContents;
    http_request.open('GET', url + parameters, true);
    http_request.send(null);
}

///////////////////////////////////////////////////////////////////
////
///////////////////////////////////////////////////////////////////
function alertContentsSAMPLE() {
    if (http_request.readyState == 4) {
	if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById('myspan').innerHTML = result;            
	} else {
            alert('There was a problem with the request.');
	}
    }
}
   
///////////////////////////////////////////////////////////////////
////
///////////////////////////////////////////////////////////////////
function formGet(url) {
    var getstr = "&ajax=1&";
    
    inputs  = document.getElementsByTagName("input");
    selects = document.getElementsByTagName("select");
    
    for (i=0; i<inputs.length; i++) {
	if (inputs[i].type == "text") {
	    getstr += inputs[i].name + "=" + inputs[i].value + "&";
	}
	if (inputs[i].type == "checkbox") {
	    if (inputs[i].checked) {
		getstr += inputs[i].name + "=" + inputs[i].value + "&";
	    } else {
		getstr += inputs[i].name + "=&";
	    }
	}
	if (inputs[i].type == "radio") {
	    if (inputs[i].checked) {
		getstr += inputs[i].name + "=" + inputs[i].value + "&";
	    }
	}
    }   

    for (i=0; i<selects.length; i++) {
	var sel = selects[i];
	getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
	//alert(sel.name + "=" + sel.options[sel.selectedIndex].value + "&")
    }

    formMakeRequest(url,getstr);
}