-1
Yes it is possible. Just give the menu a fixed position:
#ddmenu
{
display:block;
font-family:Arial;
text-align:center;
letter-spacing:normal;
position:fixed;left:0;top:0;
width:100%;
}
#ddmenu ul
{
width:100%;
......
}
As to the transparency, it is also the style configuration(e.g. { opacity: 0.7; })