JavaScript Tab Inserts Tab / How To Insert An Actual Tab in an Input or Textarea

The textarea or input. This is inline via onkeydown.
<textarea cols="50" onkeydown="return interceptTabs(event,this);" rows="15"></textarea>
The javascript
function interceptTabs(evt,control){
    key=evt.keyCode?evt.keyCode:evt.which?evt.which:evt.charCode;
    if(key==9){
        insertAtCursor(control,'t');
        return false;
    }
    else{
        return key;
    }
}
function insertAtCursor(myField, myValue){
    if(document.selection){
        /* ie */
        myField.focus();
        sel=document.selection.createRange();
        sel.text=myValue;
    }
    else if(myField.selectionStart||myField.selectionStart=='0'){
        /* mozilla support */
        var startPos=myField.selectionStart;
        var endPos=myField.selectionEnd;
        restoreTop=myField.scrollTop;
        myField.value=myField.value.substring(0,startPos)+myValue+myField.value.substring(endPos,myField.value.length);
        myField.selectionStart=startPos+myValue.length;
        myField.selectionEnd=startPos+myValue.length;
        if(restoreTop>0){
            myField.scrollTop=restoreTop;
        }
    }
    else{
        myField.value+=myValue;
    }
}
EDIT: see the jQuery version of this http://darklaunch.com/2009/02/03/javascript-insert-tabs-into-textarea-insert-tabs-into-input-javascript-tab-indent
Did this help you? Please let me know with a comment. Thank you
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