var clientPC = navigator.userAgent.toLowerCase(); // Get client info
var is_gecko = /gecko/.test( clientPC ) &&
	!/khtml|spoofer|netscape\/7\.0/.test(clientPC);
var webkit_match = clientPC.match(/applewebkit\/(\d+)/);

function insertTags(id, tagOpen, tagClose, sampleText) {
    txtarea = document.getElementById(id);

    // IE
    if (document.selection  && !is_gecko) {
        var theSelection = document.selection.createRange().text;
        if (!theSelection)
            theSelection=sampleText;
        txtarea.focus();
        if (theSelection.charAt(theSelection.length - 1) == " ") { // exclude ending space char, if any
            theSelection = theSelection.substring(0, theSelection.length - 1);
            document.selection.createRange().text = tagOpen + theSelection + tagClose + " ";
        } else {
            document.selection.createRange().text = tagOpen + theSelection + tagClose;
        }

    // Mozilla
    } else if(txtarea.selectionStart || txtarea.selectionStart == '0') {
        var replaced = false;
        var startPos = txtarea.selectionStart;
        var endPos = txtarea.selectionEnd;
        if (endPos-startPos)
            replaced = true;
        var scrollTop = txtarea.scrollTop;
        var myText = (txtarea.value).substring(startPos, endPos);
        if (!myText)
            myText=sampleText;
        if (myText.charAt(myText.length - 1) == " ") { // exclude ending space char, if any
            subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";
        } else {
            subst = tagOpen + myText + tagClose;
        }
        txtarea.value = txtarea.value.substring(0, startPos) + subst +
            txtarea.value.substring(endPos, txtarea.value.length);
        txtarea.focus();
        //set new selection
        if (replaced) {
            var cPos = startPos+(tagOpen.length+myText.length+tagClose.length);
            txtarea.selectionStart = cPos;
            txtarea.selectionEnd = cPos;
        } else {
            txtarea.selectionStart = startPos+tagOpen.length;
            txtarea.selectionEnd = startPos+tagOpen.length+myText.length;
        }
        txtarea.scrollTop = scrollTop;

    // All other browsers get no toolbar.
    // There was previously support for a crippled "help"
    // bar, but that caused more problems than it solved.
    }
    // reposition cursor if possible
    if (txtarea.createTextRange)
        txtarea.caretPos = document.selection.createRange().duplicate();
    return false;
}