Check if given object is a DOM element

isDomElement.js

function isElement(obj) {
    try {
        //Using W3 DOM2 (works for FF, Opera and Chrom)
        return obj instanceof HTMLElement;
    }
    catch(e){
        //Browsers not supporting W3 DOM2 don't have HTMLElement and
        //an exception is thrown and we end up here. Testing some
        //properties that all elements have. (works on IE7)
        return (typeof obj==="object") &&
            (obj.nodeType===1) && (typeof obj.style === "object") &&
            (typeof obj.ownerDocument ==="object");
    }
}