var isIE = (navigator.appName == "Microsoft Internet Explorer");
var hasFocus = true;
var active_element;

function setFocusEvents()
{
	active_element = document.activeElement;
	if (isIE)	{
		document.onfocusout = function() {	onWindowBlur();	      }
		document.onfocusin = function()	 {	onWindowFocus();     }
	}	else	{
		window.onblur = function()	  {	onWindowBlur();	         }
		window.onfocus = function()	 {	onWindowFocus();       }
	}
}

function onWindowFocus()	{
	hasFocus = true;
}

function onWindowBlur()	{
	if (active_element != document.activeElement) {
		active_element = document.activeElement;
		return;
	}
	hasFocus = false;
}



function activateWindow()
{
	if(!hasFocus)
	{
		alert(MSG_CHALLENGER_WAITING);
	}
	else
	{
		return;
	}
}