How to get the start and end points of selection in text area?

i want to get the cursor start and end position of a selected range in a text-field or text-area. i tried lot of functions in various forums. but when the last character of the selection is a new line character JavaScript ignore it in IE6. any one having idea ?

thank you
Nayana Adassuriya

 

function get_selection(textarea) {
	// Code for IE
	if (document.selection) {
	    textarea.focus();
		return document.selection.createRange().text;
	} else {
	// Code for Mozilla Firefox
		var len = textarea.value.length;
	    var start = textarea.selectionStart;
		var end = textarea.selectionEnd;
		var scrollTop = textarea.scrollTop;
		var scrollLeft = textarea.scrollLeft;
        return textarea.value.substring(start, end);
	}
}

Code (markup):