On going body column layout

I have been having a problem every time i try to make 3 columns float side by side. I start with dimensions that should work,
but never do. I adjust them until they finally line up side by side. I do not see how, but it works.
I have finally decided to get to the bottom of this and find what i am doing wrong.
Here is the page that does not work http://roofgenius.com/test.asp
body width 721px so the side adds are close to the table
table 461 px
add images 120px each + 10px margins each= 260px
 
  total 461
        260
        ----
        721
            The head portion is copied from a page I paid a coder to create and it works.
            What am i doing wrong ?
isnoend2001Asked:
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Jagadishwor DulalConnect With a Mentor Braces MediaCommented:
See this example what you want is:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<style type= "text/css">
table.NailTable {
	font-family: verdana,arial,sans-serif;
	width: 460px;
	font-size:11px;
	color:#333333;/*black*/
	border-width: 1px;
	border-color: #666666;/*dark gray */
	border-collapse: collapse;
	margin: auto;
}
table.NailTable th {
	border-width: 1px;
	padding: 4px;
	border-style: solid;
	border-color: #0066ff; /*blue */
	background-color: #f0f0f0;/*light gray */
}
table.NailTable td {
    height: 20px;
	border-width: 1px;
	padding: 2px;
	border-style: solid;
	border-color: #666666; /*dark gray */
	background-color: #ffffff;/*white */
}
table.NailTable .leftcol th{
width: 240px;
text-align: center;}

h1 { color:#000099;
	font:24px/22px Arial, Helvetica, sans-serif;
    font-weight: 600;
	text-align:center;
	}
h2 { font-size: 20px;
 font-weight: bold;
  text-align: center; }	
	
h3 { font-size: 16px;
 font-weight: bold;
  text-align: center; }
  
h4 { font-size: 11px;
 font-weight: bold;
  text-align: center; }
  
  
 .bodywidth{
 width: 761px; 
  } 
 .rightColumn{ 
 width: 120px; 
 float: left;
 margin-left:10px;
  	}
	.leftcolumn{
	width: 120px;
	float: left;
	margin-right:10px;
	
	 }
	 .centercolumn{
	 width: 461px;
	 float: left;
	 margin:0px auto;
	  }
</style>
</head>
<body>
<div class="bodywidth">
<div class="leftcolumn">
<img src="http://roofgenius.com/images/_TallAdRight.jpg" alt="" border="0" height="609" width="120">
</div><!--rightcolumn-->

<div class="centercolumn">


<h3>What size roofing nails to use</h3>

<table class="NailTable">
<caption><h3>Composition Shingles</h3></caption>
<tbody><tr>
	<th class="leftcol" rowspan="2"><h4>Comp Shingles</h4></th>
	<th colspan="4"><h4>Sheathing Thickness</h4></th>
	
	
</tr>
<tr>
	<th><h4>3/8"</h4></th>
	<th><h4>1/2"</h4></th>
	<th><h4>5/8"</h4></th>
	<th><h4>3/4"</h4></th>
	
	
</tr>
<tr>
	<td><h4>3-Tab comp shingles (Bare sheathing</h4></td>
	<td style="text-align: center">1"</td>
	<td style="text-align: center">1"</td>
	<td style="text-align: center">1"</td>
	<td style="text-align: center">1"</td>
	
	
</tr>
<tr>
	<td>Dimensional comp shingles (Bare sheathing)</td>
	<td style="text-align: center">1"</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/4"</td>
	
</tr>
<tr>
	<td>3-Tab comp shingles over 3 Tab comp shingles</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/2"</td>	
</tr>
<tr>
	<td>Dimensional comp shingles over 3 Tab</td>
	<td style="text-align: center">1-1/4"</td>
	<td style="text-align: center">1-1/2"</td>
	<td style="text-align: center">1-1/2"</td>
	<td style="text-align: center">1-1/2"</td>	
</tr>
</tbody></table>
<br>

<table class="NailTable">
<caption><h3>Wood Shakes(minimum 3/4 " sheathing)</h3></caption>
<tbody><tr>
	<th class="leftcol">Wood Shakes</th>
	<th class="leftcol">Nail Type</th>
	<th class="leftcol">Minimum Length</th>
	</tr><tr>
	<td>18" Straight Split</td>
	<td style="text-align: center">5d Box</td>
	<td style="text-align: center">1-3/4"</td>	
	</tr><tr>
	<td>
	18" and 24" Handsplit and Resawn 
	</td>
	<td style="text-align: center">6d Box</td>
	<td style="text-align: center">2"</td>
	</tr>
	<tr><td>
	24" Tapersplit</td> 
	<td style="text-align: center">5d Box</td>
	<td style="text-align: center">1-3/4"</td>
	</tr><tr>
	<td>18" and 24" Tapersawn</td>
	<td style="text-align: center">6d Box</td>
	<td style="text-align: center">2"</td>
	</tr>	
	</tbody></table>
	<br>
	<table class="NailTable">
<caption><h3>Wood Shingles(minimum 3/4 " sheathing)</h3></caption>
<tbody><tr>
	<th class="leftcol">Wood Shingles</th>
	<th class="leftcol">Nail Type</th>
	<th class="leftcol">Minimum Length</th>
	</tr><tr>
	<td>18" Straight Split</td>
	<td style="text-align: center">3d Box</td>
	<td style="text-align: center">1-1/4"</td>	
	</tr><tr>
	<td>
	18" and 24" Handsplit and Resawn 
	</td>
	<td style="text-align: center">4d Box</td>
	<td style="text-align: center">1-1/2"</td>
	</tr>
	</tbody></table>
	</div><!--centercolumn-->
	<div class="rightColumn">
<img src="http://roofgenius.com/images/_TallAd2.jpg" alt="" border="0" height="609" width="120">
</div><!--leftcolumn-->
	 <!--bodywidth-->   
  

</body>
</html>

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Jagadishwor DulalBraces MediaCommented:
See the list of your mistake as you are wrote above you are using 120px for both sidebar but:

.bodywidth {
    width: 701px;
}

.leftcolumn {
    float: left;
    margin-right: 5px;
    width: 130px;
}
.rightColumn {
    float: left;
    margin-left: 5px;
    width: 130px;
}

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Now your tables are not in centercolumn
<div class="centercolumn">


<h3>What size roofing nails to use</h3>
</div>

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isnoend2001Author Commented:
Thanks agadishdulal i do not understand your answer
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isnoend2001Author Commented:
Thanks
that works I will have to examine your code to see what i was doing wrong.
How do i center all 3 columns in the page ?
0
 
Jagadishwor DulalBraces MediaCommented:
Update your style sheet:

.bodywidth {
    width: 701px;
    margin:0 auto;

}

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isnoend2001Author Commented:
Thanks
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