var xmlHttp
function chk_vendidos(strid)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("O browser não suporta HTTP Request")
return
}
var url="vlr_medio.php"
url=url+"?id_util="+strid
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged1
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

function stateChanged1()
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
	
	document.getElementById("show_car").innerHTML=xmlHttp.responseText 
	
	} 
}








function GetXmlHttpObject(){
var xmlHttp=null;
try
{
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e)
{
//Internet Explorer
try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
}
return xmlHttp;
}