1 

     2 function insertText(text, areaId) {

     3     var textarea = jQuery('#' + areaId);

     4     if (document.selection) { // IE

     5         var selLength;

     6         textarea.focus();

     7         sel = document.selection.createRange();

     8         selLength = sel.text.length;

     9         sel.text = text;

    10         sel.moveStart('character', selLength-text.length);

    11         sel.select();

    12     } else if (textarea.selectionStart || textarea.selectionStart == '0') { // mozilla

    13         var startPos = textarea.selectionStart;

    14         var endPos = textarea.selectionEnd;

    15 	// insert text so that it replaces the [startPos, endPos] part

    16         textarea.value = textarea.value.substring(0,startPos) + text + textarea.value.substring(endPos,textarea.value.length);

    17 	// set cursor pos at the end of the inserted text

    18         textarea.selectionStart = textarea.selectionEnd = startPos+text.length;

    19         textarea.focus();

    20     } else { // safety belt for other browsers

    21         textarea.value += text;

    22     }

    23 }