Problema con imagenes

[tokiodata]

<buen día.

tengo un problema con unas imágenes y creo que el problema lo ocaciona el css.
tengo unas imágenes las cuales les quite el fondo blanco y las guarde como png, ya no tienen fondo y cuando las inserto me aparecen con fondo blanco. pero intente con un documento sin css cambiándole solo el fondo negro e inserte las misma imágenes y aparecen sin fondo entonces esto me hace pensar que el css tiene algún error pero la verdad no doy.

dejo aqui el css

Código:

* { margin: 0; padding: 0; outline: 0 }

body {
	background: #000000;
	font: 11px/1.75em Verdana, Tahoma, arial, sans-serif;
	color: #666666; 
	text-align: center;
	margin: 0 0 15px 0;	
}

/* links */
a, a:visited {	
	color: #1AA03C; 
	background: inherit;
	text-decoration: none;		
}
a:hover {
	//*color: #383d44;
	background: inherit;
	padding-bottom: 0;
	border-bottom: 2px solid #dbd5c5;*//
}

/* headers */
h1, h2, h3 {
	font-family: 'Trebuchet MS', Tahoma, Sans-serif;
	font-weight: Bold; 	
	color: #333;		
}
h1 {
	font-size: 160%;	
	font-weight: normal;
}
h2 {
	font-size: 130%;
	text-transform: uppercase;	
}
h3 {
	font-size: 130%;	
}

h1, h2, h3, p {
	padding: 10px;		
	margin: 0;
}
ul, ol {
	margin: 5px 20px;
	padding: 0 20px;
}

/* images */
img {
	background: #FAFAFA;
    border: 1px solid #DCDCDC;
	padding: 8px;
}
img.float-right {
  	margin: 5px 0px 10px 10px;  
}
img.float-left {
  	margin: 5px 10px 10px 0px;
}

code {
  	margin: 5px 0;
  	padding: 10px;
  	text-align: left;
  	display: block;
  	overflow: auto;  
  	font: 500 1em/1.5em 'Lucida Console', 'courier new', monospace ;
  	/* white-space: pre; */
  	background: #F5F5F5;
	border-left: 3px solid #D4D4D4;
}
acronym {
  cursor: help;
  border-bottom: 1px dashed #777;
}
blockquote {
	font: bold 1.4em/1.5em 'Trebuchet MS', Tahoma, Sans-serif;	
	margin: 10px;
 	padding: 0 0 0 25px;  
   background: #F5F5F5;
	border-left: 3px solid #D4D4D4;	
	color: #444;
}

/* start - table */
table {
	border-collapse: collapse;
	margin: 10px;	
}
th strong {
	color: #fff;
}
th {
	background: #e7e6e6 url(button.jpg) repeat-x;
	height: 29px;
	padding-left: 12px;
	padding-right: 12px;	
	text-align: left;
	border-left: 1px solid #f4f4f4;
	border-bottom: solid 2px #fff;
	color: #333;
}
tr {
	height: 30px;
}
td {
	padding-left: 11px;
	padding-right: 11px;
	border-left: 1px solid #fff;
	border-bottom: 1px solid #fff;
}
td.first,th.first {
	border-left: 0px;
}
tr.row-a {
	background: #F8F8F8;
}
tr.row-b {
	background: #EFEFEF;		
}
/* end - table */

/* form elements */
form {
	margin:10px; padding: 0 5px;
	background: #F5F5F5;	
}
label {
	display:block;
	font-weight:bold;
	margin:5px 0;
}
input {
	padding:2px;
	border:1px solid #eee;
	font: normal 1em Verdana, sans-serif;
	color:#777;
}
textarea {
	width:400px;
	padding:2px;
	font: normal 1em Verdana, sans-serif;
	border:1px solid #eee;
	height:100px;
	display:block;
	color:#777;
}
input.button { 
	font: bold 12px Arial, Sans-serif; 
	height: 24px;
	margin: 0;
	padding: 2px 3px; 
	color: #333;
	background: #e7e6e6 url(button.jpg) repeat-x;
	border: 1px solid #dadada;
}

/* search form */
.searchform {
	background-color: transparent;
	border: none;	
	margin: 0 5px 0 10px; padding: 5px 0 15px 0;	
	width: 190px;	
}
.searchform p { margin: 0; padding: 0; }
.searchform input.textbox { 
	width: 100px;
	color: #777; 
	height: 18px;
	padding: 2px;	
	border: 1px solid #E5E5E5;
	vertical-align: top;
}
.searchform input.button { 
	width: 60px;
	height: 24px;
	padding: 2px 5px;
	vertical-align: top;
}

/********************************************
   LAYOUT
********************************************/ 
#wrap {
	position: relative;
	width: 1110px;	
	margin: 0 auto;
	text-align: left;
	background: #000000 url(content.jpg) repeat-y center top;
}
#content-wrap {
	float: left;
	width: 1050px;
	margin-left: 30px;
	display: inline;
	padding: 0; 	
	border-top: 5px solid #fff;
	background: #000000 url(content-wrap.jpg) repeat-x; 
}
#header {
	position: relative;
	background: #fff url(header-bg.jpg) repeat-y center top;
	height: 35px;
	width:910px;	
	padding: 0;	
	color: #fff;	
}

/* header links */
#header #header-links {
	position: absolute;
	top: 8px; right: 45px;	
	color: #838181;
	font-size: 10px;	
	font-weight: bold;
}
#header #header-links p {	
	padding: 0;	margin: 0;	
}
#header #header-links a {	
	color: #838181;
	text-decoration: none;	
}
#header #header-links a:hover {
	color: #444;		
}

/* header-photo */
#header-photo {
	position: relative;
	clear: both;
	margin: 5px auto;
	height: 250px;
	width: 850px;
	background: #fff url(header-photo.jpg) no-repeat center center;
}
#header-photo h1#logo-text a {
	position: absolute;
	margin: 0; padding: 0;
	font: bold 48px 'Trebuchet MS', Arial, Sans-serif;
	letter-spacing: -1px;
	color: #fff;
	text-transform: none;
	text-decoration: none;
	border: none;
	
	/* change the values of top and left to adjust the position of the logo*/
	top: 25px; left: 30px;	
}

#header-photo h2#slogan {
	position: absolute;
	margin: 0; padding: 0;
	font: bold 14px 'Trebuchet MS', Arial, Sans-serif;
	text-transform: none;
	color: #B6D1F8;
	
	/* change the values of top and left to adjust the position of the slogan*/
	top: 80px; left: 35px;		
}

/* Navigation */
#nav {
	clear: both;	
	padding: 0;			
}
#nav ul {
	float: left;
	list-style: none;
	background: #E4E4E4 url(nav.jpg) repeat-x;	
	width: 850px;		
	padding: 0;	margin: 0 0 0 30px;
	height: 45px;
	display: inline;
	text-transform: uppercase;
}
#nav ul li {
	display: inline;
	margin: 0; padding: 0;
}
#nav ul li a {
	display: block;
	float: left;
	width: auto;
	margin: 0;
	padding: 0 15px;	
	border-right: 1px solid #dadada;
	border-left: 1px solid #fafafa;	
	border-bottom: none;
	color: #555;
	font: bold 14px/45px "Century Gothic", "Trebuchet MS", Helvetica, Arial, Geneva, sans-serif;
	text-transform: uppercase;
	text-decoration: none;	
	letter-spacing: 1px;
}
#nav ul li a:hover, 
#nav ul li a:active {
	color: #326ea1;
}
#nav ul li#current a {	
	background: #DBDBDB url(nav-current.jpg) repeat-x;		
}

/* Main Column */
.three-col #main {
	margin: 10px 190px 0 200px;
}
.two-col #main {
	margin: 10px 5px 0 200px;
}

#main h1 {
	margin: 10px 10px 0 10px;
	font: normal 1.8em Georgia, "Times New Roman", Times, serif;
	color: #444;
	padding: 15px 0 2px 0px; 		
	border-bottom: 1px solid #dadada;
}

/* Sidebar */	
#sidebar {
	float: left;
	width: 195px;	
	margin-top: 10px;	
}	
/* right column */
#rightcolumn {
	float: right;
	width: 190px;
	margin-top: 10px;	
}
#rightcolumn h1, #sidebar h1 {
	margin: 10px 5px 0 5px;
	padding: 5px 5px; 
	font: bold 1.4em 'Trebuchet MS', Tahoma, Sans-serif;
	color: #444; 		
}

/* sidemenu */
ul.sidemenu {
	text-align: left;
	margin: 7px 8px 8px 10px; padding: 0;			
	border-top: 1px solid #E5E5E5;
	text-decoration: none;	
}
ul.sidemenu li {
	list-style: none;
	padding: 4px 0 4px 5px;
	margin: 0 2px;		
	border-bottom: 1px solid #E5E5E5;
}
* html body ul.sidemenu li {
	height: 1%;
}
ul.sidemenu li a {
	text-decoration: none;	
	color: #326ea1; 
	border: none;		
}
ul.sidemenu li a:hover {	
	color: #383d44;
	border: none;
}

/* footer-wrap */
#footer-wrap {
	clear: both;
	width: 1110px;
	font-size: 95%;
	padding: 20px 0;
	text-align: left;	
	background: url(footer-bottom.jpg) no-repeat center bottom;	
}
#footer-wrap a {
	text-decoration: none;
	color: #666666;
	font-weight: bold;
}
#footer-wrap a:hover {
	color: #000;	
}
#footer-wrap p {
	padding: 10px 0;
}
#footer-wrap h2 {
	color: #666666;
	margin: 0;
	padding: 0 10px; 
}

/* footer */
#footer {
	clear: both;
	color: #000000;	
	margin: 0 auto 10px auto; 
	width: 1000px;
	padding: 5px 0;
	text-align: center;
	background: #000000;
	border-top: 1px solid #F2F2F2;	
}
#footer1 {
	
	
	
		
	
width: 330px;
  float: left;

	border-right: 1px solid  #FFFFFF;
	
	
	
	
}
#footer2 {
	width: 330px;
  float: left;

border-right: 1px solid #FFFFFF;
}
#footer3 {
width: 330px;
  float: left;
}
/* alignment classes */
.float-left  { float: left; }
.float-right { float: right; }
.align-left  { text-align: left; }
.align-right { text-align: right; }

/* display and additional classes */
.clear { clear: both; }

/* post */
.post-by {
	font-size: .95em;	
	padding-top: 0;
}
.post-footer {
	background: #F5F5F5;
	padding: 5px; margin: 20px 10px 0 10px;	
	font-size: 95%;	
	color: #666666;	
}
.post-footer .date{
	margin: 0 10px 0 5px;	
}
.post-footer a.comments {
	margin: 0 10px 0 5px;	
}
.post-footer a.readmore {
	margin: 0 10px 0 5px;	
}