[SOLVED] Ajax - PHP div load and reload it but ... HELP (thanks)

[aliento]

Hello.

I am using ajax and php to communicate with mysql.

I am using select box with onchange attribute to load the content into a div some info from a PHP script. It works grate for one time but when i change the select option for second time it returns the two contents into the same div.

Why?

Below is the code of the ajax which in is the problem!

 

var xmlHttp

function loadtables(str)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}
var url="tables.php"
url=url+"?database="+str
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById("tables").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;
}

 

Thank you in advanced.

[aliento]

With the new firefox everything is ok!