Unterminated String Literal

im trying to read an xml file and put it into a textarea on my page.
here is the code that returns the xml file as a string:

Document doc = new Document();
SAXBuilder saxBuilder = new SAXBuilder("org.apache.xerces.parsers.SAXParser");
XMLOutputter xmlOut = new XMLOutputter(Format.getPrettyFormat());
doc = saxBuilder.build(filesName);
String xml = outputter.outputString(doc);

no when i try to pass this to a javascript as follows:
function putXML(fileName){
var blah = '<%= xml %>'
document.btraxtestForm.HighwayMessage.innerText=blah;
}

it gives me a unterminated string literal error.

also, i will never know the contents of this xml file so i cant split up the string.
has anyone any ideas how i will fix this?