At that line you have the following javascript code:
var jautw = document.getElementById("ja-usertoolswrap");
This means that your variable jautw searching for object with id=ja-usertoolswrap, which in your html page cannot be found.
For that reason javascript throws error "nul is null or not an object".
You can rewrite your function like this:
jaToolsHover = function() {
try {
var jautw = document.getElementById("ja-usertoolswrap");
jautw.onmouseover=function() {
this.className="ja-toolswraphover";
}
jautw.onmouseout=function() {
this.className="";
}
}
catch(errmsg){}
}
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