[Solved] Textarea indent 4 spaces jQuery & Codeigniter

When I click on my button "c" it should indent the selected text by four spaces. How ever it works fine for one line but if I select multiple lines it only indents the very first line I need it to indent all selected text.

Question how to indent multiple selected lines if.

Live example here

PHP Code:

$('.c').click(function() {
    wrapText("message", "   ", "");
}); 


PHP Code:

function wrapText(elementID, openTag, closeTag) {
    var textArea = $('#' + elementID);
    var len = textArea.val().length;
    var start = textArea[0].selectionStart;
    var end = textArea[0].selectionEnd;
    var selectedText = textArea.val().substring(start, end);
    var replacement = openTag + selectedText + closeTag;
    textArea.val(textArea.val().substring(0, start) + replacement + textArea.val().substring(end, len));
}

$('.b').click(function() {
    wrapText("message", "**", "**");
});

$('.i').click(function() {
    wrapText("message", "*", "*");
});

$('.c').click(function() {
    wrapText("message", "   ", "");
}); 


There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!