CSS - Cross Browser Alignment Issues

/* Div Structure */

#heading { 
margin: 0;
position: relative;
top: -20px;
background-color:#0066CC;
}

#search { 
float: left;



}


#img {
float:left;
}

#text {
float:right;
}

#phone {

position: relative ;
float: right ;
top: 15px ;
right: 10px


}


#head {
margin: 5px ;
padding: 0; 
height: 195px;
background-color: #FDFCFF;
border: solid;
border-color: #0066CC; 
border-width: 2px; 
background-color: #FDFCFF;
}



#headnav {
float: right ;
margin: 100px 17px 5px 10px; 
padding: 0;
}

#sidebar {
float: left ;
background-color:#FDFCFF;
border-width:2px;
border-style:solid;
border-color: #0066CC;
padding: 10px;
width: 170px;
margin: 2px;
margin-top: 5px;
height: 530px ; 
}

#mainpage { 
float: right; 
position:relative; 
width: 730px ; 
right:  -5px; 
left: -5px;
border: solid;
border-color: #0066CC; 
border-width: 2px; 
background-color: #FDFCFF;

margin-top: 5px;



}

/* Side Bar */

	#sidebar h3 {
		color:black; 
		font-size: 11px;
		font-weight: normal;
		letter-spacing: 0.2em;
		margin: 5px;
		padding: 0px;
		text-transform: uppercase;
		border-bottom:dashed;
		border-bottom-color:black;
		border-width: 1px;
		}
		
	#sidebar ul, #sidebar ol {
		list-style: none;
		margin: 0;
		padding: 0;
	
		
		
		}
		
		
		
	
	
	#sidebar li {

		margin: 0;
		list-style:none;
		padding: 0;
		font-family:Arial, Helvetica, sans-serif;
		font-size:12px;
		}
		
	#sidebar a {
		color: #9999FF;
		text-decoration:none;
		}
		
	#sidebar a:hover {
	color: black;
	text-decoration:underline;

	}
		
	#sidebar div { 
		margin: 20px 0;
		padding: 0;
		}
/* Header Style */ 

	#head h1  {
	font-family:Verdana, Arial, Helvetica, sans-serif ;
	letter-spacing: 0.5em;
	font-size: 2em;
	color: black;
	
	}
	#head a { 
	color: black; 
	text-decoration: none;
	}
	
	
/* Head Nav */ 

	
	#headnav a  { 
	color: black; 
	text-decoration:none; 
	}
	#headnav a:hover { 
	text-decoration:underline;
	}
	
	#headnav p { 
	color:black; 
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size:0.1em;
	
	}

/* Main Page */ 

	#mainpage img { 
	padding: 10px;
	}
	
	#mainpage h2 { 
	font-family: Verdana, Arial, Helvetica, sans-serif; 
	color:black; 
	letter-spacing: 0.5em;
	font-style: bold ;
	border-bottom: solid;
	border-bottom-color:#0066CC;
	border-bottom-width: 2px;
	
	}
	#mainpage p {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	
	}
	
	#mainpage li { 
	font-family:Arial, Helvetica, sans-serif;
	font-size: 12px;
	
	} 
	
	#mainpage h3 { 
	font-family:Verdana, Arial, Helvetica, sans-serif; 
	border-bottom: dotted; 
	border-bottom-color: black;
	border-bottom-width: 1px ;
	latter-spacing: 0.2 em; 
	font-size:18px;
	}
	
	#mainpage a {
	color: #910B2D;
	text-decoration:none;
	}
	
	#mainpage a:hover {
	color:silver;
	text-decoration:underline;
	}
	
	/* Phone */ 
	
	#phone p { 
	color: black ;
	font-family: Arial, Helvetica, sans-serif;
	font-size: 18px ;

}

/* Heading's */ 

#heading h2 { 
color: white; 
}

a:link {
	color:black;
	text-decoration:underline;
}
a:active {
	color:black;
	text-decoration:none;
}
a:hover {
	color:black;
	text-decoration:none;
}
a:visited {
	color:black;
	text-decoration:underline;
}
body {
	background-color:#BBCCFF;
	font-family:Calibri, Arial, Helvetica, sans-serif;
	margin-bottom:0;
	margin-top:0;
}
div {
	border:0px solid #FF0000;
	border-top-width:0;
}
img {
	border-width:0;
}

.even{
	background-color:#FFCCBB;
}
.odd {
	background-color:#BBCCFF;
}
.preload{
	display:none;
	left:-9001px;
	position:absolute;
	top:-9001px;
}

#background {
	height:100%;
	left:0;
	margin:0;
	overflow:hidden;
	padding:0;
	position:absolute;
	top:0;
	width:100%;
	z-index:-9001;
}
#backgroundLeft{
	position:fixed;
	top:0;
	left:0;
	height:100%;
}
#backgroundRight{
	position:fixed;
	top:0;
	right:0;
	height:100%;
}
#body {
	background-color:#FFFFFF;
	color:#000000;
	min-height:250px;
}
#container {
	border:1px solid black;
	border-bottom-width:0;
	border-top-width:0;
	height:100%;
	margin:0 auto 0 auto;
	min-height:100%;
	min-width:760px;
	width:95%;
}
#diggThis {
	background-color:transparent;
	margin-left:-27px;
	z-index:-9001;
}
#footer {
	background-color:#FFFFFF;
	text-align:center;
	font-size:small;
}
#header {
	background-color:#000000;
	height:271px;
}
#leftMenu {
	background-color:#BBCCFF;
	float:left;
	margin-right:4px;
	padding:4px;
	width:260px;
}
#main {
	min-width:500px;
	padding:4px;
}
#main .title {
	font-size:xx-large;
	font-weight:bold;
}
#menu {
	background-image:url("images/menuGradient.png");
	background-repeat:repeat-x;
	border-top:1px solid #7E7E7E;
	border-bottom:1px solid #4E4E4E;
	color:#FFFFFF;
	font-weight:900;
	height:35px;
	position:relative;
	top:-35px;
}
#menu a:link {
	color:white;
	text-decoration:underline;
}
#menu a:active {
	color:white;
	text-decoration:none;
}
#menu a:hover {
	color:white;
	text-decoration:none;
}
#menu a:visited {
	color:white;
	text-decoration:underline;
}
#menu .button {
	background-image:url("images/menuButtonUp_blue.png");
	background-position:center;
	background-repeat:no-repeat;
	color:#FFFFFF;
	font-weight:600;
	height:35px;
	overflow:hidden;
	padding:0;
	text-align:center;
	width:106px;
}
#menu table {
	padding:0;
	text-align:center;
	width:100%;
}
#menu tr {
	padding:0;
}
#userPanel {
	position:absolute;
	right:3%;
	top:136px;
	width:200px;
	height:100px;
	background-color:#BBCCFF;
}

  

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


 <html>


 <head>


 <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />


 <title>Omega Destiny</title>


  


 <style type="text/css">


  


 body


 {


     background-color: #CCCCCC;


                   color: #FFFFFF;


 }


 a:link


 {


     text-decoration:none;


                   color: #104E8B;


                   background-color: #E8E8E8;


 }


 a:hover


 {


     text-decoration: none;


                   color: #104E8B;


                   background-color: #E8E8E8;


 }


 a:visited


 {


     text-decoration:none;


                   color: #104E8B;


                   background-color: #E8E8E8;


 }


 a:active


 {


     text-decoration: none;


     color: #104E8B;


                   background-color: #E8E8E8;


 }


 #wrapper


 {


     width:900px;


     margin:0px auto;


             text-align: center;


 }


 #header 


 {


     height:100px;


     background-color: #CCCCCC;


     background-image: url(http://img476.imageshack.us/img476/1419/banner7sy.jpg);


                   background-repeat: no-repeat;


     background-position: left; 


                   color: #FFFFFF;


 }


 #cornernav


 {


     text-align: center;


                   float:right;


                   width: 580px;


                   background-color: #E8E8E8;


                   color: #000000;


                   border: 1px solid #000000;


                   height: 99px;


 }


 #cornernav h2


 {


                  background-image: url(http://img204.imageshack.us/img204/664/maintitle8wo.jpg);


                  text-align: center;


     font-size:100%;


     height:1em;


     line-height:1.6em;


                   padding-bottom: 9px;


                   margin-top: 0px;


     position: relative;


                   bottom: -1px;


 }


  


  


  


 #cornernav p


 {


     margin-left: 10px;


     margin-right: 10px;


     margin-top: -10px;


 }


 #sidenav


 {


     float: left;


     width: 18%;


     background-color: #E8E8E8;


     color: #000000;


     border: 1px solid #000000;


 }


 #sidenav a:link


 {


     text-decoration: none;


     color: #000000;


     font-weight: bold;


     background-color: #E8E8E8;    


 }


 #sidenav a:hover


 {


     text-decoration: none;


     color: #104E8B;


     font-weight: bold;


     background-color: #E8E8E8;


 }


 #sidenav a:visited


 {


     text-decoration: none;


     color: #000000;


     font-weight: bold;


     background-color: #E8E8E8;


 }


 #sidenav a:active


 {


     text-decoration: none;


     color: #000000;


     font-weight: bold;


     background-color: #E8E8E8;


 }


  


 #sidenav h2


 {


     background-image: url(http://img204.imageshack.us/img204/664/maintitle8wo.jpg);


                   text-align: center;


     font-size:100%;


     height:1em;


     line-height:1.6em;


                   padding-bottom: 9px;


                   margin-top: 0px;


                   position: relative;


                   bottom: -1px;


 }


 #sidenav p


 {


     margin-left: 10px;


     margin-right: 10px;


     margin-top: -10px;


 }


 #content


 {


     float: right;


     text-align: left;


     width: 80%;


     background-color: #E8E8E8;


     color: #000000;


     border: 1px solid #000000;      


 }


 #content p


 {


     margin-left: 10px;


     margin-right: 10px;


 }


 #content h2


 {


     background-image: url(http://img204.imageshack.us/img204/664/maintitle8wo.jpg);


     text-align: center;


     font-size:100%;


     height:1em;


     line-height:1.6em;


                   padding-bottom: 9px;


                   margin-top: 0px;


     position: relative;


                   bottom: -1px;


 }


 /* .footer


 {


     text-align:center;


     float:right;


     font-size:12px; 


     color: #000000;


     margin-bottom: 20px;


     width: 80%;


     background-color: #E8E8E8;


 } */


 </style>


 </head>


  


  


 <body>


 <div id="wrapper">


  


 <div id="header">


 <div id="cornernav">


 <h2>Interent Service</h2>


 <p>


 This is a box designed to be a short and comprehensive. You can use it to give a statement for what the website is about, a quote or simply some random text. Anything goes, since you are the one that is going to use it. There is enough space for three full lines of text. Enjoy!


 </p>


 </div></div>


  


 <br />


 <div id="sidenav">


 <h2>Site Navigation</h1><br />


 <p><a href="#">Home</a><br />


 <a href="#">About</a><br />


 <a href="#">Contact Us</a><br />


 <a href="#">Portfolio</a><br /></p>


 </div>


  


 <div id="content">


 <h2>Omega Destiny</h2>


 <p><a href="#">Welcome</a> to my website template called Omega Destiny. It is a big improvement from my previous design called "Arcane Flame" and is meant to have a very professional look with its gray theme.


 Omega Destiny is table-less and entirely based on divs.</p>


 </div>


  


 <!--


 <div class="footer">


 Design by "Moridin". Copyright 2006 All Rights Reserved.


 </div> -->


 </div>


 </body>


 </html> 

.header { position: relative; padding-bottom: 0; z-index: 20; }
#banner-top { float: right; line-height: 0; margin: 20px 20px 20px 0px; }
.logo { float: left; margin: 0 50px 0 20px; }
.logo.image { line-height: 0px; }
.logo .plain-text { font-size: 20px; line-height: 30px; font-weight: bold; }
.logo #tagline { font-size: 11px; font-style: italic; }

#search-bar { float:left;
              margin-top:25px;
              z-index:500;}

#search-bar #home_search { 
display: block;
    height: 40px;
    margin: 0;
    padding: 4px;
    position: relative;
    width: 595px;}

#search-bar #home_search_input { background: none repeat scroll 0 0 transparent;
    border: 1px solid #C6C6C6;
    color: #666666;
    display: inline-block;
    font-size: 12px;
    height: 40px;
    line-height: 14px;
    padding: 0 10px;
    width: 480px; }




#search-bar #home_search_submit {
	border: 1px solid #dc5653;	
    background: #fe5d62; /*fallback for non-CSS3 browsers*/
    background: -webkit-gradient(linear, 0 0, 0 100%, from(#fe8781) to(#fe5d62)); /*old webkit*/
    background: -webkit-linear-gradient(#fe8781, #fe5d62); /*new webkit*/
    background: -moz-linear-gradient(#fe8781, #fe5d62); /*gecko*/
    background: -ms-linear-gradient(#fe8781, #fe5d62); /*IE10*/
    background: -o-linear-gradient(#fe8781, #fe5d62); /*opera 11.10+*/
    background: linear-gradient(#fe8781, #fe5d62); /*future CSS3 browsers*/
    -pie-background: linear-gradient(#fe8781, #fe5d62); /*PIE*/

 repeat scroll 0 0 transparent;
    border: 0 none !important;
    color: #FFFFFF;
    cursor: pointer;
    display: inline-block;
    font-size: 16px;
    font-weight: bold;
    height: 43px;
    padding: 0 10px;
    margin-left: 6px;
    width: 80px;}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript" src="styleSheetSwitcher.js"></script>
</head>

<body><center>
<div id="main">Hello
<div id="centerbox">world</div>
</div></center></body>
</html>

#main {
		position: relative; 
		background-image:url(images/Driving_bkg3.gif);
		background-repeat: no-repeat;
		height: 100%;
		left: 5%;
}
    

    #centerbox {
        margin: -20% 3% 0 40%;
        padding: 0%;
        width: 41%;
        height: auto;
        background-color:#C9F;
        }

<div id='dashed_box'>

<div class='divleft'>Company Name:</div><div class='divright'><input type='text' name='company_name' size='32' class='boxes'></div>

<div class='spacer'>&nbsp;</div>
</div>

#dashed_box
{
  border: 1px dashed #333333; 
  margin:5 auto;
  padding:5 auto;
  width: 600px;
}
.divleft {
  font-family: verdana;
  font-size: 12px;
  line-height: 20px;
  float: left;
  text-align: right;
  color: #000;
  width: 49%;
  }

.divright {
  font-family: verdana;
  font-size: 10px;
  float: right;
  text-align: left;
  font-weight: bold;
  color: #000;
  width: 49%;
  }
 
div.spacer {
  clear: both;
  }