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<script type="text/javascript">
function Bold() {
    
    var txtarea = document.getElementById("area");
    var selStart = txtarea.selectionStart;
    var selEnd = txtarea.selectionEnd;
    
    document.getElementById("area").value=
    (txtarea.value).substring(0,selStart)+
    "[B]"+(txtarea.value).substring(selStart, selEnd)+"[/B]" +
    (txtarea.value).substring(selEnd,txtarea.value.length);
}
</script>

[HTML] pobierz, plaintext 
<form onsubmit="return false">
    <textarea id="area" style="width:300px;height:150px"></textarea><br /><br />
    <button onclick="Bold()">B</button>
</form>
[HTML] pobierz, plaintext 

function Bold() {

    var txtarea = document.getElementById("wpis");
    var selStart = txtarea.selectionStart;
    var selEnd = txtarea.selectionEnd;
    var length = ((txtarea.value).substring(selStart, selEnd)).length;
    var b = document.getElementById("b").value;

if (length >= 1) {

    document.getElementById("wpis").value = (txtarea.value).substring(0,selStart) + "[B]" +
    (txtarea.value).substring(selStart, selEnd) + "[/B]" + (txtarea.value).substring(selEnd,txtarea.value.length);

} else {

    if (b == "B") {

    document.getElementById("b").value = "B *";
    document.getElementById("wpis").value = (txtarea.value).substring(0,selStart) + "[B]" + (txtarea.value).substring(selEnd,txtarea.value.length);

    } else if (b == "B *") {

    document.getElementById("b").value = "B";
    document.getElementById("wpis").value = (txtarea.value).substring(0,selStart) + "[/B]" + (txtarea.value).substring(selEnd,txtarea.value.length);

    }

}

document.getElementById("wpis").focus();

}

[HTML] pobierz, plaintext 
<input type="button" value="B" id="b" onClick="Bold()" onFocus="blur()">
<textarea id="wpis"></textarea>
[HTML] pobierz, plaintext