hide a button tools

Hello,
I have a problem with which I want to hide the buttons tools on the dashboard page using javascript,
When i execute this sript                                                                                          

var t = window.document.getElementById("dashboard-tools-dropdown");
t.style.display="none";  

on the browser console its walking but when i put it in live filed or the ad banner it displays this error

 Dashboard.jspa:306 Uncaught TypeError: Cannot read property 'style' of null at 

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