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Hmm that's strange - the blue line is gone when I made added "transparent" to the CSS
#header-l {margin: 0;padding: 0;background: transparent url("../images/tl.png") no-repeat left;height: 194px;}
#header-r {margin: 0;padding: 0;background: transparent url("../images/tr.png") no-repeat right;height: 194px;}