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;
}

function addOption(element, text, value){
	element.options[element.options.length] = new Option(text, value);	
}