How to see xml tags in jquery alert

How to see xml tags in jquery alert

hi all, i am currently working with jquery..I want to show the xml contents in the alert using jquery. i am using the following code. but while executing it the output is shown as an object .i want to see the xml structure.can any one help me plz.

function test() {

    var xmlDocument = $.parseXML("<Collection/>");
    var FacetCategories = xmlDocument.createElement('FacetCategories');
    var FacetCategory = xmlDocument.createElement('FacetCategory');
    var FacetCategoryAttr = document.createAttribute('Name');
    FacetCategory.addAttr(FacetCategoryAttr);
    FacetCategories.appendChild(FacetCategory);
    xmlDocument.documentElement.appendChild(FacetCategories);
    alert(xmlDocument.xml);
}