CSS Columns Layout

/* Columns Layout Coding - From: http://www.babooforum.com.br/forum/index.php?/topic/579450-css-alinhar-divs-uma-ao-lado-da-outra/*/
#maincontainer{
 width: 660px; /*Width of main container*/
 margin: 0 auto 0 auto; /*Center container on page*/
 font-family: "Times New Roman", Times, serif;
 font-size: 12px;
 text-align: center;
 color: #333333;
 background: transparent;
 height: auto;
}

#centercolumn{
 float: left;
 margin: 10px auto 0 auto;
 width: 210px; /*Width of left column in pixel*/
 margin-left: auto; /*Set margin to that of -(MainContainerWidth)*/
 background: transparent url("Imagens/alpha_white.gif") repeat;
 height: 650px;
 border-left: 1px dashed #666666;
}

#leftcolumn{
 margin: 10px auto 0 auto;
 float: left;
 width: 210px; /*Width of left column in pixel*/
 margin-left: auto; /*Set margin to that of -(MainContainerWidth)*/
 background: transparent url("Imagens/alpha_blue.gif") repeat;
 height: 650px;
 border-left: 1px dashed #666666;
}

#rightcolumn{
 margin: 10px auto 0 auto;
 float: left;
 width: 210px; /*Width of right column*/
 margin-right: auto; /*Set left margin to -(RightColumnWidth)*/
 background: transparent url("Imagens/alpha_blue.gif") repeat;
 height: 650px;
 border-left: 1px dashed #666666;
 border-right: 1px dashed #666666;
}

#rightcolumn, #leftcolumn, #centercolumn {
 padding-top: 10px;
}