Finding and inserting text using caretPos

How can I do this in non-IE browsers?

[GaryK]

The below code is used to store the system caret in a textarea and then use it to insert text at that position. Unfortunately it only works in IE. I always know what browser my users are using so is there code that will work in non-IE browsers? Thanks.

function InsertTextAtSystemCaret(paramTextAreaObject, paramTextToInsert) {
if (paramTextAreaObject.createTextRange && paramTextAreaObject.caretPos) {
var caretPos = paramTextAreaObject.caretPos;
caretPos.text =
caretPos.text.charAt(caretPos.text.length - 1) == ' '?
text + ' ' : paramTextToInsert;
} else {
paramTextAreaObject.value = paramTextAreaObject.value + paramTextToInsert; // non-IE browsers
}
return true;
}

function StoreSystemCaret(paramTextAreaObject) {
if (paramTextAreaObject.createTextRange) { paramTextAreaObject.caretPos = document.selection.createRange().duplicate(); }
}

[GaryK]

Does the lack of response mean this can't be done? Or that my thread got lost in all the traffic? I'd sure appreciate some help with this problem. Many thanks.