codice:
<html>
	<head>
		<style type='text/css'>
			
			div.divBottone {
				float: left;
				margin: 0;
				margin-right: 10px;
				padding: 0;
				width: auto;
				height: 20px;
				border: none;
				background: transparent;
			}
			
			span.bottone {
				display: block;
				float: left;
				height: 20px;	
				margin: 0;
				padding: 0;
				background-repeat: no-repeat;
				padding-top: 7px;
			}
			
			.bottoneTesto {
				font-size: 11px;
				color: #ffffff;
				font-family: "Trebuchet MS";
				font-weight: bold;
				text-decoration: none;
				position: relative;
				display: inline;
				top: -4px;
				
			}
			
			a.rollover {
				background: transparent;		
				color: #ffffff;
				text-decoration: none;
				margin: 0;
				padding: 0;
			}
			
			a:hover.rollover {
				background: transparent;		
				color: #ffffff;
				text-decoration: none;
				margin: 0;
				color: black;
				padding: 0;
			}
			
			span.bottoneSx {
				width: 6px;				
				background-color: transparent;
				background-position: 0 0;
			}
			
			a.rollover span.bottoneSx {
				background-image: url(../images/btn-left.png);
				margin: 0;
			}
			
			a:hover.rollover span.bottoneSx {
				background-image: url(../images/btn-left-on.png);
				margin: 0;		
			}
			
			/* CENTRO BOTTONE */		
			
			span.bottoneCentro {
				width: auto;				
				background-color: transparent;
				background-repeat: repeat-x;
				background-position: 0 0;
				
			}
			
			a.rollover span.bottoneCentro {	
				background-image: url(../images/btn-center.png);	
				margin: 0;					
			}
			
			a:hover.rollover span.bottoneCentro {
				background-image: url(../images/btn-center-on.png);	
				margin: 0;					
			}
			
			/* FINE BOTTONE */
			
			span.bottoneDx {
				width: 6px;				
				background-color: transparent;			
				background-position: 0 0;
			}
			
			a.rollover span.bottoneDx {
				background-image: url(../images/btn-right.png);	
				margin: 0;
			}
			
			a:hover.rollover span.bottoneDx {
				background-image: url(../images/btn-right-on.png);
				margin: 0;
			}

			td.formInput {
				/*border-right: 5px solid black;*/
				padding-left: 10px;
				padding-bottom: 10px;
				width: 110px;		
				font-size: 11px;
				line-height: 10px		
			}
			
			td.formInputField {
				padding-bottom: 10px;
			}
			
			.campoLeftLeft{
				float:left;
				text-align:left;
			}
			
			.clear{
				clear:both;
				line-height:1px;	
				font-size:1px; /*solo safari*/
			}
			
			div.bottoneBackSx {
				background-image: url(btn-left-on.png);
				margin: 0;
				padding: 0;
				float:left;
				background-repeat: no-repeat;
			}
			
			div.bottoneBack {
				background-image: url(btn-center-on.png);
				margin: 0;
				padding: 0;
				float:left;
				background-repeat: repeat-x;
			}
			
			div.bottoneBackDx {
				background-image: url(btn-right-on.png);
				margin: 0;
				padding: 0;
				float:left;
				background-repeat: no-repeat;
			}
		
		</style>
	</head>
	<body style="background-color: #D3ECF5;">

		<table style="width: 830px;">
			<tbody>
				<tr>
					<th>CODICE FISCALE<span class="mandatory">*</span><span class="obbligatorio"></span></th>
					<td>
						<div class="clear"></div>
						<span class="campoLeftLeft"><input type="text" class="sinistra" onblur="javascript:this.value=this.value.toUpperCase();" value="" tabindex="5" size="19" maxlength="16" name="codFiscaleContribuente"></span>
						<div style="width: 28%;" class="campoLeftLeft">
							<div class="divBottone">
								<a href="javascript:rubrica();" title="" class="rollover">
									<div class="bottoneBackSx">
										<span class="bottone bottoneSx"></span>
									</div>
									<div class="bottoneBack">
										<span class="bottone bottoneCentro">
											<span class="bottoneTesto">
												<span>Rubrica</span>
											</span>
										</span>
									</div>
									<div class="bottoneBackDx">
										<span class="bottone bottoneDx"></span>
									</div>
								</a>
							</div>
						</div>
					</td>
				</tr>
			</tbody>
		</table>

	</body>

</html>
Su certi computer eliminando i file temporanei il bottone si vede male (IE8). Su tutti i computer su cui ho provato io si vede male la prima volta (etichetta sfasata) e poi sempre bene, anche eliminando cookie e file temp !!

Ci possono essere versioni diverse di ie8 ?