Get rid of the Add page between this and your DIO-Tools page @ Userscripts. That is not appropriate and I think against the rules. But, even if it's not against the rules, don't do it. It's just wrong.
Looking at the script, I see you're using base64 strings for the sound/images, but you're also using images on another site. The cross-site reference for images is not pretty, and you have no control over the images on those sites. I'd recommend using base64 strings for those.
Example:
'<div class="m_middle"><img class="m_cont" id="m_uni" src="http://666kb.com/i/cjq6cxia4ms8mn95r.png"></div>'+
'<div class="m_div"></div>'+
'<div class="m_middle"><img class="m_cont" id="m_fav" src="http://s14.directupload.net/images/140120/tvfuuhep.png"></div>'+
'<div class="m_right"></div></div>').appendTo('.nui_toolbar .middle');
You also use an image array which contains an array of images, yet only use it in certain spots and hard code other images in other spots.
Again with the Adds:
$('<div class="smiley_box">'+
'<div class="bbcode_box middle_center"><div class="bbcode_box middle_right"></div><div class="bbcode_box middle_left"></div>'+
'<div class="bbcode_box top_left"></div><div class="bbcode_box top_right"></div><div class="bbcode_box top_center"></div>'+
'<div class="bbcode_box bottom_center"></div><div class="bbcode_box bottom_right"></div><div class="bbcode_box bottom_left"></div>'+
'<div align="center" style="width:100%;">'+
'<a class="group" name="standard" href="">'+ LANG[LID].sml.std +'</a>'+
'<a class="group" name="grepolis" href="">'+ LANG[LID].sml.gre +'</a>'+
'<a class="group" name="nature" href="">'+ LANG[LID].sml.nat +'</a>'+
'<a class="group" name="people" href="">'+ LANG[LID].sml.ppl +'</a>'+
'<a class="group" name="other" href="">'+ LANG[LID].sml.oth +'</a>'+
'</div>'+
'<hr class="smiley_hr">'+
'<div class="smiley_box_cont" style="overflow: hidden;"></div>'+
'<hr class="smiley_hr">'+
'<div align="center" style="margin-top:2px;"><a href="http://adf.ly/eDbBl" target="_blank"><span class="smiley_link">WWW.GREENSMILIES.COM</span></a></div>'+
'</div>').appendTo(bbcodeBarId + ' .bb_button_wrapper');
Putting in Adds in tools like this is just wrong in my books.
I'm not sure about the chat replacement.