function createXHR( )
 {
	if (window.XMLHttpRequest)  // Mozilla, Safari,...
	{
		objXHR = new XMLHttpRequest( );

		if (objXHR.overrideMimeType)
			objXHR.overrideMimeType('text/xml');
	}

	else if (window.ActiveXObject)  // IE
	{
		try
		{
			objXHR = new ActiveXObject("Msxml2.XMLHTTP");
		}

		catch(e)
		{
			try
			{
				objXHR = new ActiveXObject("Microsoft.XMLHTTP");
			}
				
			catch(e)
			{
				
			}
		}
	}

	if (!objXHR)
	{
		alert('Giving up :( Cannot create an XMLHTTP instance');
     			
    			return null;
	}
	
	return objXHR;
 }
 
 
 function addLoadEvent(loadEvent)
 {
	var oldonload = window.onload;
	
   	if (typeof window.onload != 'function')
       		window.onload = loadEvent;
	
	else
	{
     		window.onload = function( )
     		{
       			oldonload( );
       			loadEvent( );
     		}
   	}
 }