function doPost(url, content, callback_name) {
	var async_request = false;

	// Mozilla/Safari
	if (window.XMLHttpRequest) {
		async_request = new XMLHttpRequest();
		//async_request.overrideMimeType('text/xml');
	}
	// IE
	else if (window.ActiveXObject)	{
		async_request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	async_request.open('POST', url, true);
	async_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	async_request.onreadystatechange = function() {
		if (async_request.readyState == 4) {
			response_content = async_request.responseText;
			eval(callback_name + '(response_content);');
		}
	}
	async_request.send(content);
}

function convertFormDataToPostContent(form_name) {
	var content_to_submit = '';
	var form_element;
	var last_element_name = '';

	for (i = 0; i < form_name.elements.length; i++)	{
		form_element = form_name.elements[i];
		switch (form_element.type)	{
		// Text fields, hidden form elements
		case 'text':
		case 'hidden':
		case 'password':
		case 'textarea':
		case 'select-one':
			content_to_submit += form_element.name + '=' 
			+ escape(form_element.value) + '&'
			break;

		// Radio buttons
		case 'radio':
			if (form_element.checked) {
				content_to_submit += form_element.name + '=' 
				+ escape(form_element.value) + '&'
			}
			break;

		// Checkboxes
		case 'checkbox':
			if (form_element.checked) {
				// Continuing multiple, same-name checkboxes
				if (form_element.name == last_element_name) {
					// Strip of end ampersand if there is one
					if (content_to_submit.lastIndexOf('&') == 
					content_to_submit.length - 1) {
						content_to_submit = content_to_submit.substr(
						0, content_to_submit.length - 1);
					}
					// Append value as comma-delimited string
					content_to_submit += ',' + escape(form_element.value);
				} else {
					content_to_submit += form_element.name + '=' 
					+ escape(form_element.value);
				}
				content_to_submit += '&';
				last_element_name = form_element.name;
			}
			break;
		}
	}

	// Remove trailing separator
	content_to_submit = content_to_submit.substr(0, content_to_submit.length - 1);
	return content_to_submit;
}

var req;

function loadXMLDoc(url) {
	//alert(url);
	req = false;
    // branch for native XMLHttpRequest object
    if(window.XMLHttpRequest) {
    	try {
			req = new XMLHttpRequest();
        } catch(e) {
			req = false;
        }
    // branch for IE/Windows ActiveX version
    } else if(window.ActiveXObject) {
       	try {
        	req = new ActiveXObject("Msxml2.XMLHTTP");
      	} catch(e) {
        	try {
          		req = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch(e) {
          		req = false;
        	}
		}
    }
	if(req) {
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send("");
	}
}

function processReqChange() {
    // only if req shows "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
            // ...processing statements go here...
			//alert('pagina carregada');
			//alert(req.responseText); 
			//exibe a TR de situação
			//document.getElementById('situacao').style.display = "";
			if (req.responseText>=5){
				alert('O limite de links na página inicial foi excedido!');
				document.getElementById('pag_inicial').checked = false;
			} 
				
			
			//alert(req.responseText);
			//var vetorResposta=req.responseText.split("/");
			
			//vetorResposta = split req.responseText;
			//document.getElementById('nomeVia').innerHTML=vetorResposta[0];
			/*switch (vetorResposta[1]){
			  case 'L':
					document.getElementById('resposta').style.color ="green";
			  		document.getElementById('resposta').innerHTML="Livre";
			  		break
			  case 'E':
			  		document.getElementById('resposta').style.color ="orange";
			  		document.getElementById('resposta').innerHTML="Lenta";
			  		break
			  case 'C':
			  		document.getElementById('resposta').style.color ="red";
			  		document.getElementById('resposta').innerHTML="Congestionada";
			  		break
			} */ 
			      
		} else {
            //alert("There was a problem retrieving the XML data:\n" + req.statusText);
			alert("Ocorreu um erro.");
        }
    }
}