function bbcode(tag,tage,el) 
{ 
if (document.getElementById(el).setSelectionRange) { 
var tagstart; 
tagstart="["+tag+"]"; 
var tagend; 
tagend="[/"+tage+"]"; 
document.getElementById(el).value =
document.getElementById(el).value.substring(0,document.getElementById(el).selectionStart)
+ tagstart +
document.getElementById(el).value.substring(document.getElementById(el).selectionStart,
document.getElementById(el).selectionEnd)
+ tagend +
document.getElementById(el).value.substring(document.getElementById(el).selectionEnd,
document.getElementById(el).value.length); 
} 
else 
{ 
var selectedText = document.selection.createRange(el).text; 

if (selectedText != "") { 
var newText = "[" + tag + "]" +
selectedText + "[/" + tage +
"]"; 
document.selection.createRange(el).text = newText; 
} else {document.getElementById(el).value += "[" + tag + "]" + "[/" + tage +"]";}
} 

}