Now you are asking for waaay to much.
Undo the previous template edit, and add this to your additional.css
Code:
/* Start remove collapse */
.blocksubhead img
{
display: none;
}
.blockhead img
{
display: none;
}
.forumbit_nopost .forumhead a.collapse img
{
display: none;
}
/* End remove collapse */
That way it takes care of all you want, and is safe from upgrades.