su consiglio di fcaldera apro un post
dunque ho dei problemi con il min-height in quanto su tutti browser classici si visualizza corretamente mentre su firefox nisba
poi sempre fcaldera mi ha passato un codice da provare

codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="it" xml:lang="it">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>xhtml 1.0</title>
        
        <style type="text/css">
        div {
            height      : auto !important;
            height      : 300px;
            min-height  : 300px;
            
            border      : 1px solid #300;
        }
        </style>
        
    </head>

<body>

    <div>300</div>

</body>
</html>
e devo dire che lo visualizzo corretamente su tutti quanti
quindi il problema è nel mio codice, ma pur guardandol e rguardandolo non riesco a trovare una "falla". riuscite a vederci qualcosa voi?
grazie

codice:
/* Layout */
#container{
	background: url(images/bg_container.gif) repeat-y;
	border-right: #000099 10px solid;
	border-left: #000099 10px solid;
  
}
#mainframe{
	background: #FFFFFF;
	height      : auto !important;
    height      : 800px;
    min-height  : 800px;


}
#header{
	
	position: relative;
	height: 130px;
}
#logo {
	position: absolute;
	top: 30px;
	left: 20px;
	display: block;
	width: 390px;
	height: 70px;
	background: url(images/logo.gif) no-repeat;
}
#welcome {
	font-size: 90%;
	color: #FFFFFF;
	float: right;
	padding: 35px 60px 0 0 ;
	text-align: right;
	line-height: 170%;
}
#welcome a:link, #welcome a:visited {
		color: #FFFF00;
		font-weight: bold;
}

#welcome a:hover {
		text-decoration: underline;
}
#toolbar {
	background: #000066;
	font-weight: bold;
}
#newsearch{
	background: url(images/bg_newsearch.jpg) repeat-x top #FFFFFF;
	padding: 5px 10px;
}
#newsearch a:link, #newsearch a:visited{
	font-weight: bold;
}
.footerarea{
	color: #FFFFFF;
	font-size: x-small;
}
.footerarea a:link, .footerarea a:visited{
	color: #FFFF00;
	font-weight: bold;
	text-decoration: none;
}
.footerarea a:hover{
	text-decoration: underline;
}
/* TP specific classes */
.sitemap{
	margin: 0;
	padding: 0;
	list-style: none;
}
.sitemap_topheader{
	background: #ECEDF3;
	border-bottom: solid 1px #ffffff;
	padding: 4px;
}

.sitemap_header{
	background: #ECEDF3;
	border-bottom: solid 1px #ffffff;
	padding: 4px;
	display: block;
	font-weight: bold;
 }

.sitemap_header_active{
	background: #C8D6E1;
	border-bottom: solid 1px #ffffff;
	padding: 4px;
	display: block;
	font-weight: bold;
}

.sitemap_header:hover , .sitemap_header_active:hover{
	background: #DBE4ED;
	border-bottom: solid 1px #ffffff;
	padding: 4px;
	display: block;
	text-decoration: none;
}

/* TP other styles */
ul#articlelist
{
	margin: 0;
	padding: 0.5ex 0;
	list-style: none;
}
ul#catlist
{
	margin: 0;
	padding: 0;
	list-style: none;
	border-top: solid 1px #d0d0d0;
}

ul#articlelist li
{
	margin: 0;
	display: block;
	padding: 0 0 0 3ex;
	background: url(images/divider.gif) no-repeat 5px 3px;
}
ul#catlist li
{
	display: block;
	padding: 0 0 0 3ex;
	margin: 0;
}

/* TP rss feed styles */
.rss_title{
 font-weight: bold;
}

.rss_body{
	margin-bottom: 1ex;
}

.rss_image{
	margin: 4px 0 4px 0;
}
/* Normal, standard links. */
a:link
{
	color: #000099;
	text-decoration: none;
}
a:visited
{
	color: #000099;
	text-decoration: none;
}
a:hover
{
	color: #000066;
	text-decoration: underline;
}

/* Navigation links - for the link tree. */
.nav, .nav:link, .nav:visited
{
	color: #000099;
	text-decoration: none;
}
a.nav:hover
{
	color: #000066;
	text-decoration: underline;
}

/* Tables should show empty cells. */
table
{
	empty-cells: show;
}

/* By default (td, body..) use verdana in #222222. */
body, td, th , tr
{
	color: #222222;
	font-size: small;
	font-family: verdana, sans-serif;
	line-height: 140%;
}

/* The main body of the entire forum. */
body
{
	background: url(images/bg.gif) repeat-x fixed #777;
	margin: 0px;
	padding: 0px;
}

/* Input boxes - just a bit smaller than normal so they align well. */
input, textarea, button
{
	color: #222222;
	font-family: verdana, sans-serif;
}
input, button
{
	font-size: 90%;
}

textarea
{
	font-size: 100%;
	color: #222222;
	font-family: verdana, sans-serif;
}

/* All input elements that are checkboxes or radio buttons. */
input.check
{
}

/* Selects are a bit smaller, because it makes them look even better 8). */
select
{
	font-size: 90%;
	font-weight: normal;
	color: #222222;
	font-family: verdana, sans-serif;
}

/* Standard horizontal rule.. ([hr], etc.) */
hr, .hrcolor
{
	height: 1px;
	border: 0;
	color: #777777;
	background-color: #777777;
}

/* No image should have a border when linked */
a img
{
	border: 0;
}
/* A quote, perhaps from another post. */
.quote {
	color: #222;
	background-color: #fff;
	border-left: 5px solid #B4D1E7;
	margin: 5px;
	padding: 10px 5px;
	font-size: x-small;
	line-height: 1.5em;
}

/* A code block - maybe even PHP ;). */
.code
{
	color: #222222;
	background-color: #dddddd;
	font-family: "courier new", "times new roman", monospace;
	font-size: x-small;
	line-height: 1.3em;
	/* Put a nice border around it. */
	border: 1px solid #222222;
	margin: 1px auto 1px auto;
	padding: 1px;
	width: 99%;
	/* Don't wrap its contents, and show scrollbars. */
	white-space: nowrap;
	overflow: auto;
	/* Stop after about 24 lines, and just show a scrollbar. */
	max-height: 24em;
}

/* The "Quote:" and "Code:" header parts... */
.quoteheader, .codeheader
{
	color: #222222;
	text-decoration: none;
	font-style: normal;
	font-weight: bold;
	font-size: x-small;
	line-height: 1.2em;
}

/* Generally, those [?] icons.  This makes your cursor a help icon. */
.help
{
	cursor: help;
}

/* /me uses this a lot. (emote, try typing /me in a post.) */
.meaction
{
	color: red;
}

/* The main post box - this makes it as wide as possible. */
.editor
{
	width: 96%;
}

/* Highlighted text - such as search results. */
.highlight
{
	background-color: yellow;
	font-weight: bold;
	color: #222222;
}

/* Alternating backgrounds for posts, and several other sections of the forum. */
.windowbg, #preview_body {

	background-color: #E7EFF5;
	padding: 5px;
}

.windowbg2 {

	background-color: #D5E6F3;
	padding: 5px;
	
}

.windowbg3 {

	background-color: #B4D1E7;
	padding: 5px;
	
}
/* ahahah */
.windowbgblock {

	background-color: #E7EFF5;
	
}
/* the today container in calendar */
.calendar_today
{
	background-color: #FFFFFF;
}

/* These are used primarily for titles, but also for headers (the row that says what everything in the table is.) */
.titlebg, tr.titlebg th, tr.titlebg td, .titlebg2, tr.titlebg2 th, tr.titlebg2 td
{
	color: #222222;
	font-style: normal;
	background: #b4d1e7;
	padding-left: 10px;
	padding-right: 10px;
}
.titlebg, .titlebg a:link, .titlebg a:visited
{
	font-weight: bold;
	color: #222222;
	font-style: normal;
}

.titlebg a:hover
{
	 text-decoration: underline;
}
/* same as titlebg, but used where bold text is not needed */
.titlebg2 a:link, .titlebg2 a:visited
{
	color: #222222;
	font-style: normal;
	text-decoration: underline;
}

.titlebg2 a:hover
{
	text-decoration: underline;
}

/* blocchi tinyportal */
.titlebgblock, tr.titlebgblock th, tr.titlebgblock td
{
	color: #222222;
	font-style: normal;
	background: #B4D1E7;
	padding-left: 10px;
	padding-right: 10px;
}
.titlebgblock, .titlebgblock a:link, .titlebgblock a:visited
{
	font-weight: bold;
	color: #222222;
	font-style: normal;
}

.titlebgblock a:hover
{
	 text-decoration: underline;
}

/* blocchi tinyportal */
.titlebgnews, tr.titlebgnews th, tr.titlebgnews td
{
	color: #ffffff;
	font-style: normal;
	background: #000099;
	padding-left: 10px;
	padding-right: 10px;
}
.titlebgnews, .titlebgnews a:link, .titlebgnews a:visited
{
	font-weight: bold;
	color: #ffffff;
	font-style: normal;
}

.titlebgnews a:hover
{
	 text-decoration: underline;
}




/* This is used for categories, page indexes, and several other areas in the forum.
.catbg and .catbg2 is for boardindex, while .catbg3 is for messageindex and display headers*/
.catbg , tr.catbg td , .catbg3 , tr.catbg3 td
{
	background: #000099;
	color: #ffffff;
	padding-left: 10px;
	padding-right: 10px;
}
.catbg2 , tr.catbg2 td
{
	background: #000099;
	color: #ffffff;
	padding-left: 10px;
	padding-right: 10px;
}
.catbg, .catbg2
{
	font-weight: bold;
}
.catbg3, tr.catbg3 td, .catbg3 a:link, .catbg3 a:visited
{
	font-size: 95%;
	color: white;
	text-decoration: none;
}
.catbg a:link, .catbg a:visited , .catbg2 a:link, .catbg2 a:visited
{
	color: white;
	text-decoration: none;
}
.catbg a:hover, .catbg2 a:hover, .catbg3 a:hover
{
	text-decoration: underline;
}
/* This is used for tables that have a grid/border background color (such as the topic listing.) */
.bordercolor
{
	padding: 0px;
}

/* This is used on tables that should just have a border around them. */
.tborder
{
	border: none;
}

/* Default font sizes: small (8pt), normal (10pt), and large (14pt). */
.smalltext
{
	font-size: x-small;
	font-family: verdana, sans-serif;
}
.middletext
{
	font-size: 90%;
}
.normaltext
{
	font-size: small;
}
.largetext
{
	font-size: large;
}


/* Posts and personal messages displayed throughout the forum. */
.post, .personalmessage
{
	width: 100%;
	overflow: auto;
	line-height: 1.3em;
}

/* All the signatures used in the forum.  If your forum users use Mozilla, Opera, or Safari, you might add max-height here ;). */
.signature
{
	width: 100%;
	overflow: auto;
	padding-bottom: 3px;
	line-height: 1.3em;
}

/* Sometimes there will be an error when you post */
.error
{
	color: red;
}


/* definitions for the main tab, active means the tab reflects which page is displayed */
.maintab_first, .maintab_back, .maintab_last, .maintab_active_first, .maintab_active_back, .maintab_active_last
{
	color: #FFFFFF;
	text-transform: uppercase;
	vertical-align: top;
}
.maintab_back, .maintab_active_back
{
	color: #FFFFFF;
	text-decoration: none;
	font-size:  10px;
	vertical-align: top;
	padding: 9px;
}

.maintab_first
{
	background: #000066;
	width: 10px;
}
.maintab_back
{
	background: #000066;
}
.maintab_last
{
	background: #000066;
	width: 10px;
}
.maintab_active_first
{
	background: #B4D1E7;
	width: 10px;
}
.maintab_active_back
{
	background: #B4D1E7;
}
.maintab_active_last
{
	background: #B4D1E7;
	width: 10px;
}

/* how links behave in main tab. */
.maintab_back a:link , .maintab_back a:visited
{
	color: #FFFFFF;
	text-decoration: none;
}
.maintab_active_back a:link , .maintab_active_back a:visited
{
	color: #222222;
	font-weight: bold;
	text-decoration: none;
}
.maintab_back a:hover, .maintab_active_back a:hover
{
	text-decoration: underline;
}
/* definitions for the mirror tab */
.mirrortab_first, .mirrortab_back, .mirrortab_last, .mirrortab_active_first, .mirrortab_active_back, .mirrortab_active_last
{
	color: #FFFFFF;
	text-transform: uppercase;
	vertical-align: top;
}
.mirrortab_back, .mirrortab_active_back
{
	color: #FFFFFF;
	text-decoration: none;
	font-size:  10px;
	vertical-align: top;
	padding: 7px;
}

.mirrortab_first
{
	background: #000066;
	width: 10px;
}
.mirrortab_back
{
	background: #000066;
}
.mirrortab_last
{
	background: #000066;
	width: 10px;
}
.mirrortab_active_first
{
	background: #B4D1E7;
	width: 10px;
}
.mirrortab_active_back
{
	background: #B4D1E7;
}
.mirrortab_active_last
{
	background: #B4D1E7;
	width: 10px;
}

/* how links behave in mirror tab. */
.mirrortab_back a:link , .mirrortab_back a:visited
{
	color: #FFFFFF;
	text-decoration: none;
}
.mirrortab_active_back a:link , .mirrortab_active_back a:visited
{
	color: #222222;
	font-weight: bold;
	text-decoration: none;
}
.mirrortab_back a:hover, .mirrortab_active_back a:hover
{
	text-decoration: underline;
}

/* The AJAX notifier */
#ajax_in_progress
{
	background: #32CD32;
	color: white;
	text-align: center;
	font-weight: bold;
	font-size: 18pt;
	padding: 3px;
	width: 100%;
	position: fixed;
	top: 0;
	left: 0;
}