html help

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Hi, if theres any mylotians skilled in html i would be quite grateful for some help. basically on my website i am building, I have the toolbar and the titlebar a dark grey, and the main window a light grey (using tables for the layout). Now, i've decided that i want to make a smooth curve between the toolbar and the titlebar to give it a nice look. My method was toput a picture of the curve in the top left of the main windo. My problem though is that it isnt exactly next to the corner, there is about a pixel space each side which leaves a light grey line. Can anyone help? ps, i've attempted to add a picture of it, but i dont know how mylot do there pic's so you might not be able to see it.