In the following example we perform an asyncronous call; in case of error, we show it in a specific div, otherwise, we redirect the user to another page:

function submitForm(v1,v2,v3)
{
var xhr;
try { xhr = new ActiveXObject(’Msxml2.XMLHTTP’); }
catch (e)
{
try { xhr = new ActiveXObject(’Microsoft.XMLHTTP’); }
catch (e2)
{
try { xhr = new XMLHttpRequest(); }
catch (e3) { xhr = false; }
}
}

xhr.onreadystatechange = function()
{
if(xhr.readyState == 4)
{

if(xhr.status == 200)
document.location.href=”step3_fr.php?prime=” + xhr.responseText;
else
document.myerrordiv.innerhtml =”Error code ” + xhr.status;
}
};

xhr.open(”POST”, “./callquote.php”, true);
var str = “chky=”+v1+”&chkm=”+v2+”&chkd=”+v3;
xhr.send(str);
}