img che non si vedono online

[mexican]

Ciao a tutti ho un sito www.dinoricciardi.it, l'ho visto sia su firefox che su IE sul mio pc si vede perfettamente, ma su altri pc con stesso browser non si vedono le immagini della testata e dei bottoni da cosa può dipendere???
ecco il css:

/* CSS Document */

html,body{margin:0;padding:0;}
body{font: 70%  Arial, Helvetica, sans-serif;text-align:center;}
p{margin:0 10px 10px}

/*div#header h1{height:80px;line-height:80px;margin:0;
  padding-left:10px;background: #FFFFFF;color: #79B30B}*/
div#header{
height:150px;
background-image:url(http://localhost/ricciardi/images/testata.jpg);
background-repeat:no-repeat;
line-height:150px;
margin:0;
}
div#container{text-align:left;}
div#content p{line-height:1.4}
/*div#navigation{background:#B9CAFF}*/
/*div#extra{background:#FF8539}*/
div#footer{background: #333;color: #FFF}
div#footer p{margin:0;padding:5px 10px}

div#container{width:700px;margin:0 auto}
div#content{float:right;width:500px;margin-top:15px;}
div#navigation{float:left;width:200px; margin-top:15px;
}
div#extra{float:left;clear:left;width:200px;margin-top:15px;}
div#footer{clear:both;width:100%}
.intestazioni {
	font-size: 24px;
	font-weight: bold;
	color: #C51f31;
}
.messaggio {
	font-size: 12px;
	font-weight: bold;
	color:#FF0000;
}
input {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-style: normal;
	font-weight: normal;
	color: #000000;
	text-decoration: none;
	background-color:#F8F8F8;
	background-repeat: no-repeat;
	letter-spacing: normal;
	word-spacing: normal;
	white-space: normal;
	padding: 2px;
	height: auto;
	border: 1px solid #666666;
}
textarea {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-style: normal;
	font-weight: normal;
	color: #000000;
	text-decoration: none;
	background-color:#F8F8F8;
	background-repeat: no-repeat;
	letter-spacing: normal;
	word-spacing: normal;
	white-space: normal;
	padding: 2px;
	height: auto;
	border: 1px solid #666666;
}

/* Bottoni
div#container{margin: 50px;width: 500px}*/

div.button-cont{float: left;width: 150px;margin: 0.5em 0}

a.button{float: left;height: 25px;padding-left: 15px;
    font: bold 100%/25px Arial, Helvetica, sans-serif;
    background: url(http://localhost/ricciardi/images/bottone.png) no-repeat top left;
    text-decoration: none;color: #FFFFFF;}

a.button span{display:block;padding-right: 15px;
    background: url(http://localhost/ricciardi/images/bottone.png) no-repeat top right}

a.button:hover{background-position: bottom left;color: #C51f31}
a.button:hover span{background-position: bottom right}

/* Tag A*/

a.links:link {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	color: #C51f31;
	font-weight: bold;
	text-decoration: none;
}
a.links:visited {
    font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	color: #C51f31;
	font-weight: bold;
	text-decoration: none;
}
a.links:hover {
    font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	color: #CCCCCC;
	font-weight: bold;
	text-decoration: none;
}
a.links:active {
    font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	color: #C51f31;
	font-weight: bold;
	text-decoration: none;
	
}
.int_news{
 	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	color: #C51f31;
	font-weight: bold;
	text-decoration: none;
}