U.Helper

function Insert(qname,text)
{
     if (text!="")
     {
         qname = qname.replace(/[\[\]]/g, "|");
         paste("[quote="+qname+"]"+text+"[/quote]\n", 0);
     }
     else
     {
         _uWnd.alert('Select text to be quoted','',{w:230,h:80,tm:3000});
     }
}
function paste(text,flag)
{
     if ((document.selection)&&(flag))
     {
         document.addform.message.focus();document.addform.document.selection.createRange().text = text;
     }
     else document.addform.message.value += text;
}
function get_selection()  
{
     if (window.getSelection)
     {
         selection = window.getSelection().toString();
     }
     else if (document.getSelection)  
     {
         selection = document.getSelection();
     }
     else  
     {
         selection = document.selection.createRange().text;
     }
}

<a href="javascript://" title="FullQuote" onclick="Insert('$USERNAME$','http://site.com/forum/$FID$-$TID$-$ID$-16-$TIMESTAMP$'); return false" onmouseover="quote.get_selection()"><img border="0" src="http://site.com/theme/icon.png"></a>