<script type="text/javascript">
			function row_head_click_event(event) {
				check = false;
				current = event.target;
				while (current != null) {
					if (current.nodeName == 'TABLE') {
						break;
					}
					if (current.nodeName == 'TR') {
						check = !current.children[0].children[0].checked;
						current.children[0].children[0].checked = check;
					}
					current = current.parentNode;
				}
				lines = current.children[1].children
				for (i = 0; i < lines.length; i++) {
					select_row(event, lines[i], lines[i].children[0].children[0], check);
				}
			}
			function row_click_event(event) {
				if (event.target.nodeName == 'INPUT') {
					return;
				}
				current = event.target;
				while (current = current.parentNode) {
					if (current.nodeName == 'BODY') {
						break;
					}
					if (current.nodeName != 'TR') {
						continue;
					}
					e = current.children[0].children[0];
					check = !e.checked;
					select_row(event, current, e, check);
					break;
				}
			}
			function select_row(event, row, input, check) {
				if (input != event.target) {
					input.checked = check;
				}
				if (input.checked) {
					row.classList.add("selected");
				} else {
					row.classList.remove("selected");
				}
				input.focus();
			}

			for (selector of ['thead > tr', 'thead input']) {
				els = document.querySelectorAll(selector);
				for (i = 0; i < els.length; i++) {
					els[i].addEventListener('click', {handleEvent: row_head_click_event});
				}
			}
			for (selector of ['tbody > tr', 'tbody input']) {
				els = document.querySelectorAll(selector);
				for (i = 0; i < els.length; i++) {
					els[i].addEventListener('click', {handleEvent: row_click_event});
				}
			}
      butt = document.querySelectorAll('button[type=button][name=create_check]');
      for (i = 0; i < butt.length; i++) {
        butt[i].addEventListener('click', {handleEvent: function(event){
          cur = document.querySelector('#create_check').style.display; 
          console.log("meh: " + cur);
          if (cur == 'block') {
            document.querySelector('#create_check').style.display = 'none'; 
          } else {
            document.querySelector('#create_check').style.display = 'block'; 
          }
        }});
      }
    </script>
  </body>
</html>