// JavaScript Document
function getPage(method, returnFunction, url, form, displayLoading) {
    var req;
	// Mozilla/Safari
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    req.open(method, url, true);
    if(method=='POST')
		req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
	else
		req.setRequestHeader('Content-Type', 'text/html; charset=UTF-8');
		
    req.onreadystatechange = function() {
        
		switch(req.readyState){
			case 0:
				break;
			case 1:	
				if(displayLoading){
					var img = document.createElement("IMG");
					img.src = "imagens/ajax_loading.gif";
					
					var divJanela = document.createElement("div");
					divJanela.id = 'msgbox';
					divJanela.style.position = "absolute";
					divJanela.style.width = img.width;
					divJanela.style.height = img.height;
					divJanela.style.left = document.body.clientWidth-img.width;
					divJanela.style.top = document.body.clientHeight-img.height;
					var eBody = document.getElementsByTagName('body').item(0);
					
					divJanela.appendChild(img);
					eBody.appendChild(divJanela);
				}
				break;
			case 2:
				break;
			case 3:
				break;
			case 4:
				if (document.getElementById('msgbox') != null) {
					document.body.removeChild(document.getElementById('msgbox'));
				}
				var html = req.responseText;
				if(returnFunction!=null)
					eval(returnFunction+'(html)');
				break;
		}
    }
	
	if(method=='POST')
    	req.send(transForm(form));
	else
		req.send(null);
}

function transForm(form){
    var elements = form.elements;
    var pairs = new Array();

    for (var i = 0; i < elements.length; i++) {

        if ((name = elements[i].name) && (value = elements[i].value))
            pairs.push(name + "=" + encodeURIComponent(value));
    }
   return pairs.join("&");
}