JS Bookmarklet to hide an element on click

hide_element

javascript:(function(){var%20d=document,useMine=true,prevEl;function%20AddHandler(orig,mine)
{return%20function(e){if(useMine)mine(e);else%20if(orig)orig(e);};}function%20Myonmouseover(e)
{var%20evt=e||window.event;var%20elem=evt.target||evt.srcElement;elem.style.outline='2px%20solid%20gray';
prevEl=elem;}function%20Myonmouseout(e){var%20evt=e||window.event;var%20elem=evt.target||evt.srcElement;elem.style.outline='';}
function%20Myonclick(e){var%20evt=e||window.event;var%20elem=evt.target||evt.srcElement;elem.style.display='none';}
function%20Myonkeydown(e){var%20evt=e||window.event;if(evt.keyCode==27){prevEl.style.outline='';useMine=false;}}
d.onmouseover=AddHandler(d.onmouseover,Myonmouseover);d.onmouseout=AddHandler(d.onmouseout,Myonmouseout);
d.onclick=AddHandler(d.onclick,Myonclick);d.onkeydown=AddHandler(d.onkeydown,Myonkeydown);})()