function insertAtCaret(obj, text) {

if (document.selection.createRange) { // Go the IE way

var range = document.selection.createRange();

if (range.parentElement() != obj) {

obj.value += text;
obj.focus();
return;
}

range.setEndPoint(’StartToEnd’, range);
range.text = text;
range.scrollIntoView();
}
}

thanks for all the code, and especially all the discussion around it. it has been enlightening and helpful.

here’s what i’ve come up with for handling tabs and cursor movement in a reasonably cross-browser solution (no Opera just yet. IE7 works).

the specific purpose is doing tabs in textareas, but it uses all the same principles and i have some more links to background info.

http://teddevito.com/demos/textarea.html