var TextareaFunctions = new Object();

TextareaFunctions.replaceSelectedText = function(object_id, replacement) {

	// Check for Browser & Platform for PC & IE specific bits
	// More details from: http://www.mozilla.org/docs/web-developer/sniffer/browser_type.html
	var clientPC = navigator.userAgent.toLowerCase(); // Get client info
	var clientVer = parseInt(navigator.appVersion); // Get browser version
	
	var is_ie = ((clientPC.indexOf("msie") != -1) && (clientPC.indexOf("opera") == -1));
	var is_nav = ((clientPC.indexOf('mozilla')!=-1) && (clientPC.indexOf('spoofer')==-1)
		&& (clientPC.indexOf('compatible') == -1) && (clientPC.indexOf('opera')==-1)
		&& (clientPC.indexOf('webtv')==-1) && (clientPC.indexOf('hotjava')==-1));
	var is_moz = 0;
	
	var is_win = ((clientPC.indexOf("win")!=-1) || (clientPC.indexOf("16bit") != -1));
	var is_mac = (clientPC.indexOf("mac")!=-1);

    var txtarea = document.getElementById(object_id);

    txtarea.focus();
    theSelection = false;

    if (clientVer >= 4 && is_ie && is_win) {
        theSelection = document.selection.createRange().text;
        if (theSelection) {
            document.selection.createRange().text = replacement;
            txtarea.focus();
            theSelection = "";
            return;
        }
    } else if (txtarea.selectionEnd && txtarea.selectionEnd - txtarea.selectionStart > 0) {
	    var selLength = txtarea.textLength;
	    var selStart = txtarea.selectionStart;
	    var selEnd = txtarea.selectionEnd;
	    if (selEnd == 1 || selEnd == 2) {
	        selEnd = selLength;
	    }
	    var s1 = txtarea.value.substring(0, selStart);
	    var s2 = txtarea.value.substring(selStart, selEnd);
	    var s3 = txtarea.value.substring(selEnd, selLength);
	    txtarea.value = s1 + replacement + s3;
        return;
    }
    storeCaret(txtarea);
}