Code

function getSelection() {
		if(typeof document.selection != 'undefined') {
			var range = document.selection.createRange();
			return range.text;
		} else if(typeof textarea.selectionStart != 'undefined') {
			var start = textarea.selectionStart;
			var end = textarea.selectionEnd;
			return textarea.value.substring(start, end);
		} else {
			return window.prompt('Text:');
		}
	}