@bluehighways:
i found the bit of CSS that refers to the element you want to get rid of:
#header {
background:transparent url(images/bg_header.gif) no-repeat scroll center top;
display:block;
float:left;
min-height:355px;
padding:0pt;
position:relative;
width:750px;
}
and the header image you want to keep:
#mainpic {
background:transparent url(http://thinktankitaly.files.wordpress.com/2007/09/header_white1.png) no-repeat scroll 0%;
border-bottom:3px solid #67939B;
border-top:3px solid #67939B;
bottom:0pt;
display:block;
float:left;
height:229px;
margin:0pt 7px;
position:absolute;
width:736px;
}
i'm not good enough with CSS to figure out how to get rid of the dark grey bar without getting rid of the whole header, but you might want to try playing with the different attributes listed. At the very least, you can replace the dark grey bar with another image:
#header {
background:transparent url(YOUR_DIFFERENT_IMAGE_HERE) no-repeat scroll center top;
}