function changeGalleryImage(url,desc)
{
	if(!desc) desc="";
	document.getElementById("gallery").innerHTML="<img src=\""+url+"\" /><div  id=\"image_description\"><p>"+desc+"</p></div>";
}

function flickr_navi(dir,tag)
{
	document.getElementById("gallery").innerHTML="<img src=\"img/loading.gif\" />";
	var page=parseInt(document.getElementById("flickr_feed_page").innerHTML)+parseInt(dir);
	xmlHttp=GetXmlHttpObject();
	xmlHttp.onreadystatechange=function()
	{
		if(xmlHttp.readyState==4)
		{
			document.getElementById("images_list").innerHTML=xmlHttp.responseText;
		}
	}
	var url="flickr_change.php?page="+page+"&tag="+tag;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

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;
}