[Plugin: Allow PHP in Posts and Pages] Load XML

I’m trying to load an XML-file so I can read variables from it but the scripts seems to stop executing when I get to this step. The code works outside of wordpress though.

I believe it stops at xhttp.open(“GET” …

// create XML request
	if (window.XMLHttpRequest) {
		xhttp = new XMLHttpRequest();
	} else {
		// support for IE 5/6
		xhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} 

	// load XML file
	xhttp.open("GET", "http://www.maartenprovo.be/projects/form/pricing.xml", false);
	xhttp.send(null);
	xmlDoc = xhttp.responseXML;

http://ww.wp.xz.cn/extend/plugins/allow-php-in-posts-and-pages/