Selecting every checkbox on current page - Javascript

This Javascript snippet can be used to selected every checkbox on a page. var elems = document.getElementsByTagName('input'); for(var i = 0; i < elems.length; i++){ if(elems[i].getAttribute('type')=='checkbox'){ elems[i].setAttribute('checked','checked'); } } Use ? On Firefox, I used it to select all spam messages which were clogging my junk folder. I launched scrathpad ( Shift+F4 ) and pasted the Js snippet, then ran the script ( CTRL+R) and all check boxes were selected. Then I just sat back and hit the "Trash forever" button. Obviously you can use it for something else.