I have implemented a collapsible menu with a triangle bullet on expandable items. The triangle rotates when the link is clicked and sub-menus items are expanded.
The problem is that with internet explorer there is this light dotted line to the left of my bullet. It appears when I expand the item and disappear when I click somewhere else on the page.

It corresponds to nothing in my style sheet. Any idea how I can get rid of it?
This is how the bullet is styled:
#block-menu-menu-intra-acp-menu li.expanded > a{
padding-left:12px;
background: url('images/triangle_bullet_down.png') left center no-repeat;
}
This might not be it, but try setting
outline: 0;on youra?