// call this function to check for an older version of Internet Explorer without Chrome Frame installed and pop up a window
// offering a download of Chrome Frame
function browserCompatibilityWarning()
{
	var browser = navigator.userAgent;
	
	if((browser.indexOf("MSIE 7.0b") != -1
		|| browser.indexOf("MSIE 7.0") != -1
		|| browser.indexOf("MSIE 6.1") != -1
		|| browser.indexOf("MSIE 6.0b") != -1
		|| browser.indexOf("MSIE 6.01") != -1
		|| browser.indexOf("MSIE 6.0") != -1)
		)
	{
		incompatibleBrowserWarningVisibility(true);
	}
}


// shows or hides the popup offering a download of Chrome Frame (visibility = true to show, false to hide)
function incompatibleBrowserWarningVisibility(visibility)
{
	if(visibility)
	{
		$("#chromeFadeOverlay").fadeIn(0);
		$("#browserWarningPopup").fadeIn("medium");
	}
	else
	{
		$("#browserWarningPopup").fadeOut("medium");
		$("#chromeFadeOverlay").fadeOut(0);
	}
}