var xmlHttp

function conteudo(ajx,str,opt)
{ 
xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
	alert ("Este browser não suporta HTTP Request")
	return
	}


	var url = "ajax-" + ajx + ".php?id=" + str + "&opt=" + opt;
	xmlHttp.onreadystatechange=stateChanged 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById("contentAjax").innerHTML=xmlHttp.responseText 
} 
} 

function GetXmlHttpObject()
{ 
var objXMLHttp=null
if (window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
}
return objXMLHttp
}