#maincontainer{
width: 910px; /*Width of main container*/
margin: 0 auto; /*Center container on page*/
height: 1150px;
}

#contentwrapper{
float: left;
width: 100%;
}

#contentcolumn{
margin: 0 283px 0 283px; /*Margins for content column. Should be "0 RightColumnWidth 0 LeftColumnWidth*/
text-align: left;
background: #FFFFFF;
}

#leftcolumn{
float: left;
width: 283px; /*Width of left column in pixel*/
margin-left: -910px; /*Set margin to that of -(MainContainerWidth)*/
text-align: left;
background: #FFFFFF;
}

#rightcolumn{
float: left;
width: 283px; /*Width of right column*/
margin-left: -283px; /*Set left margin to -(RightColumnWidth)*/
text-align: left;
background: #FFFFFF;
}

.innertube{
margin: 10px; /*Margins for inner DIV inside each column (to provide padding)*/
margin-top: 0;
}