function getXmlHttp()
{
	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)
			{
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	return xmlHttp;
}

function getElementById(id) {
	if( document.getElementById )						//WC3 DOM
	{
		return document.getElementById(id);
	}
	else if ( document.layers )							//NS4 DOM
	{
		return document[id];
	}
	else if( document.all )								//IE4 DOM
	{
		return document.all[id];
	}
}


function getStyleById(id)
{
	var el = getElementById(id);
	if( document.getElementById || document.all )		//WC3 DOM or IE4 DOM
	{
		return el.style;
	}
	else if ( document.layers )							//NS4 DOM
	{
		return el;
	}
}