function navcal(dir)
{
	var xmlHttp;
	try
	{
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		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;
	    	}
		}
	}
	xmlHttp.onreadystatechange=function() 
	{
		if(xmlHttp.readyState==4)
		{ 
			document.getElementById("cal").innerHTML=xmlHttp.responseText;
		}
	}
	var m = document.getElementById("monthdiv").innerHTML;
	var y = document.getElementById("yeardiv").innerHTML;
	var url = "main/calendar.php?passedmonth="+m+"&passedyear="+y+"&direction="+dir;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}