function getUrlPref(id) {
	url = document.getElementById(id).src;
	return url.substr(0, url.indexOf('/js/'));
}
function addPipCalc() {
	var urlpref = getUrlPref("vtPipCalc");
	var htmlCode = "<iframe src='"+urlpref+"/pipcalc.php' frameborder=0 scrolling=no width=310 height=140></iframe>";
	if (window.nodeId) {
		var node = document.createElement("DIV");
			node.innerHTML = htmlCode;
		document.getElementById(window.nodeId).appendChild(node);
	} else {
		document.write(htmlCode);
	}
}
addPipCalc();