var request = false;

	try 
	{
		request = new XMLHttpRequest();
	} 
	catch (trymicrosoft) 
	{
		try 
		{
			request = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (othermicrosoft) 
		{
			try 
			{
				request = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (failed) 
			{
				request = false;
			}  
		}
	}

	if (!request){
		alert("Error initializing XMLHttpRequest!");
	}

	function getCustomerInfo() 
	{
		var s_type = document.getElementById("s_type").value;
		var url = "?act=getoccupation&type_id=" + escape(s_type);
		request.open("GET", url, true);
		request.onreadystatechange = updatePage;
		request.send(null);
	}

	function updatePage() 
	{
		if (request.readyState == 4)
		{
			if (request.status == 200)
			{
				document.getElementById('abcd').innerHTML = request.responseText;
			}
			else if (request.status == 404)
			{
				alert("Request URL does not exist");
			}
			else
			{
				alert("Error: status code is " + request.status);
			}
		}
	}