var xmlHttp;
var url = window.location.href;
function instrument(value,value2){
	var num = url.indexOf("?id");
	if(num > 0) {
		url = url.substr(0,num);
		window.location.href = url + '?id=' + value + '&sort='+value2;
	}
	else if(url.indexOf("&id") > 0){
		url = url.substr(0,url.indexOf("&id"));
		window.location.href = url + '&id=' + value + '&sort='+value2;
	}
	else if(url.indexOf("?") > 0){
		window.location.href = window.location.href + '&id=' + value + '&sort='+value2;
	}
	else if(url.indexOf("#") > 0){
		url = url.substr(0,url.indexOf("#"));
		window.location.href = url + '?id=' + value + '&sort='+value2;
	}
	else if((url.indexOf("?") == -1) && (value2 == 'pASC'))
		window.location.href = window.location.href + '?id=' + value + '&sort=pASC';
	else {
		window.location.href = window.location.href + '?id=' + value + '&sort=cASC';
	}	
}

function showInstruments(value,sort){ 

xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 

var url="images.php";
url=url+"?id="+value+"&sort="+sort;


xmlHttp.onreadystatechange=stateChanged;

xmlHttp.open("GET",url,true);

xmlHttp.send(null);

}

function stateChanged() 
{ 

	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		document.getElementById('sparesBLAH').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)
    { 
		try {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		} catch(e) {
          	req = false;
        }
    }
	
  }

return xmlHttp;
}

function returnObjById(id)
{
	
    if (document.getElementById)
        var returnVar = document.getElementById(id);
    else if (document.all) 
        var returnVar = document.all[id];
    else if (document.layers) 
        var returnVar = document.layers[id];
	
    return returnVar;
}