background-image:		url("filename.jpg");
	background-repeat:		repeat;
			no-repeat;
			repeat-y;
			repeat-x;
	background-color:		silver;
			#ccffcc;
			rgb(0,51,0);
	background-position:		left;	working with background-image
			center;
			right;
			top;
			bottom;
			50% 50%
			0% 0%	default
	background-attachment:		fixed;
			scroll;	default
	background:			Set all the background properties in one declaration:	#00ff00 url('smiley.gif') no-repeat fixed center;
	JavaScript syntax:			object.style.background="red url(smiley.gif) top left no-repeat"