JavaScript - return the current selection

JavaScript_getSelected.js

function getSelected() {
		if (window.getSelection) {
			return window.getSelection().toString();
		} else if (document.getSelection) {
			return document.getSelection().toString();
		} else {
			var selection = document.selection && document.selection.createRange();
			if (selection.text) {
				return selection.text.toString();
			}
			return "";
		}
		return "";
	}