// JavaScript Document
function checkBrowser()
{

this.ver=navigator.appVersion;

this.dom=document.getElementById?1:0;

this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom)?1:0;

this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;

this.ns6=(this.dom && parseInt(this.ver)>= 5)?1:0;

this.ns4=(document.layers && !this.dom)?1:0;

this.opr=(navigator.userAgent.toLowerCase().indexOf("opera")!=-1)?1:0;

return this}

//Source: http://aktuell.de.selfhtml.org/artikel/javascript/bbcode/
function InsertTag(aTag, eTag, input) {
  
  var bwr=new checkBrowser();
   input.focus();
  /* für Internet Explorer */
  if(typeof document.selection != 'undefined') {
    /* Einfügen des Formatierungscodes */
    var range = document.selection.createRange();
    var insText = range.text;
    range.text = aTag + insText + eTag;
    /* Anpassen der Cursorposition */
    range = document.selection.createRange();
    if (insText.length == 0) {
	    if(bwr.opr){
	    	range.move('character', 0);
			}else{
	      range.move('character', -eTag.length);
	    }
    } else {
    	if(bwr.opr){
    		range.move('character', 0);
    	}else{
      	range.moveStart('character', aTag.length + insText.length + eTag.length);
			}      
    }
    range.select();
  }
  /* für neuere auf Gecko basierende Browser */
  else if(typeof input.selectionStart != 'undefined')
  {
    /* Einfügen des Formatierungscodes */
    var start = input.selectionStart;
    var end = input.selectionEnd;
    var insText = input.value.substring(start, end);
    input.value = input.value.substr(0, start) + aTag + insText + eTag + input.value.substr(end);
    /* Anpassen der Cursorposition */
    var pos;
    if (insText.length == 0) {
      pos = start + aTag.length;
    } else {
      pos = start + aTag.length + insText.length + eTag.length;
    }
    input.selectionStart = pos;
    input.selectionEnd = pos;
  }
  
  
}