var xmlHttp, xmlHttp2
function SwapBlock(to)
{ 
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
		 alert ("Browser does not support HTTP Request")
		 return
	}

	var url="ajax/swapblock.php"
	url=url+"?to="+to
	url=url+"&sid="+Math.random()
	xmlHttp.onreadystatechange=stateChanged 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}


function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		document.getElementById("block1").innerHTML=xmlHttp.responseText 
	} 
}

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;
}