if ( typeof InstallTrigger == "undefined" ) {

	var script = document.createElement("script");
	script.type = "text/javascript";
	script.src = "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=MML_HTMLorMML";
	document.getElementsByTagName("head")[0].appendChild(script);
	
}

if ( typeof InstallTrigger == "undefined" ) {

	var scriptMJ = document.createElement( "script" );
//	script.type = "text/javascript";
	scriptMJ.src = "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=MML_HTMLorMML";
//	document.getElementsByTagName("head")[0].appendChild(script);
	document.body.appendChild( scriptMJ );	
}

Update check-mathml.js