var xmlHttp

function showImages(q_imagen){
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Su navegador no soporta AJAX");
 return
 }
var url="cartuchos.php"
url=url+"?q_cart="+q_imagen;
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("main_cont").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;
}