function make_products_selected()
	{
	document.getElementById('product_link').className="selected";
	document.getElementById('manufacturer_link').className="";
	}

function make_manufacturers_selected()
	{
	document.getElementById('product_link').className="";
	document.getElementById('manufacturer_link').className="selected";
	}

function view_manufacturers(processing_url)
	{
	make_manufacturers_selected();
	
	ajax = create_ajax();
  
	ajax.onreadystatechange=function()
	  {
	  if(ajax.readyState==1)
	  	{
		document.getElementById("product_listing").innerHTML="<span style='margin-left:20px;'>Retrieving manufacturers...</span>";
		}
	  if(ajax.readyState==4)
		{
		document.getElementById("product_listing").innerHTML=ajax.responseText;
		}
	  }
	  
	ajax.open("GET",processing_url,true);
	ajax.send(null);
	}

function view_products(processing_url)
	{
	make_products_selected();
	
		ajax = create_ajax();
  
	ajax.onreadystatechange=function()
	  {
	  if(ajax.readyState==1)
	  	{
		document.getElementById("product_listing").innerHTML="<span style='margin-left:20px;'>Retrieving products...</span>";
		}
	  if(ajax.readyState==4)
		{
		document.getElementById("product_listing").innerHTML=ajax.responseText;
		}
	  }
	  
	ajax.open("GET",processing_url,true);
	ajax.send(null);
	}