I tried revising the code a bit. Now is as below, but did not make a difference.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
“http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
html, body{
margin:0px;
padding:0px;
height:100%;
overflow:hidden;
}
The client side code looks correct and must not produce any problems. Which code you are using in events.php , is it have modification to save section_id value to some field in DB?