Okay, I think to do what you want you'll have to edit the CSS for this skin. The logo isn't actually an HTML IMG, but rather the background image of a DIV. That's why you can't just resize it with HTML. If you don't know what I mean, don't worry.
Find: (I could be wrong but I think you'll find this in the
headinclude template, as opposed to the
header template)
HTML Code:
#logo {
background: url(iSkin_Black/misc/hdr_logo.gif);
width: 175px;
height: 90px;
align: left;
margin: 0;
padding: 0;
}
This code controls the logo. To resize the logo, all you have to do is change 175 and 90 to whatever width and height your logo is. Don't forget the "px" after the number. Note that your actual image has to be the same size as you specify here, else it will either repeat itself, or get cut off.
Hopefully this helps!