function getAjax()
{
	// Get request object
	if( window.XMLHttpRequest )
		return new XMLHttpRequest();
	else if( window.ActiveXObject )
		return new ActiveXObject('Microsoft.XMLHTTP');
	else
		return; // No support. Oh well.
}

function fn_modelLookup(brand){
    var request = getAjax();
	if(request)
	{
		request.open("GET", "/ajax/ajax_printer_model.php?brand="+ brand, true);
		document.getElementById('printer_model').innerHTML='';
			request.onreadystatechange = function() {
				if(request.readyState == 4) {
					document.getElementById('printermodels').innerHTML = request.responseText;
				}
			}
		request.send('');
	}
	else
	{
		alert(request);
	}
}