im trying to move the black background color above the white arrow. It's a progress bar from supersized plugin - http://buildinternet.com/project/supersized/. I did some modifications to the animation, it's going from top to bottom right now but i would like to move that arrow or cut the bg color. I've tried many things without success.

html file
<!--Time Bar-->
	<div id="progress-back" class="load-item">
		<div id="progress-bar"></div>
#progress-back{ z-index:5; position:fixed; top:0px; right:0px; height:100%; width:8px; background:url('../img/progress-back.png') repeat-y; }
		#progress-bar{ position:relative; height:100%; width:100px; right:100px; background: url('../img/progress-bar.png') bottom no-repeat; background-color: #000;}
Other files you can find at official site, there is a "few" lines of code so better to download plugin package than write it all here.

Thanks in advance !

- i'm non-native english writer, sry for all my mistakes