Проблемы с версткой CSS - Вопросы по CSS

#leftcolumn {
	padding: 0;
	margin: 0;
	width: 20%;
	float:left;
}

<div id="whitebox">
				<div id="whitebox_t">
					<div id="whitebox_tl">
						<div id="whitebox_tr"></div>
					</div>
				</div>

				<div id="whitebox_m">
					<div id="area">
									<jdoc:include type="message" />

						<div id="leftcolumn">
						<?php if($this->countModules('left')) : ?>
							<jdoc:include type="modules" name="left" style="rounded" />
						<?php endif; ?>
						</div>

						<?php if($this->countModules('left')) : ?>
						<div id="maincolumn">
						<?php else: ?>
						<div id="maincolumn_full">
						<?php endif; ?>
							<?php if($this->countModules('user1 or user2')) : ?>
								<table class="nopad user1user2">
									<tr valign="top">
										<?php if($this->countModules('user1')) : ?>
											<td>
												<jdoc:include type="modules" name="user1" style="xhtml" />
											</td>
										<?php endif; ?>
										<?php if($this->countModules('user1 and user2')) : ?>
											<td class="greyline">&nbsp;</td>
										<?php endif; ?>
										<?php if($this->countModules('user2')) : ?>
											<td>
												<jdoc:include type="modules" name="user2" style="xhtml" />
											</td>
										<?php endif; ?>
									</tr>
								</table>

								<div id="maindivider"></div>
							<?php endif; ?>

							<table class="nopad">
								<tr valign="top">
									<td>
										<jdoc:include type="component" />
										<jdoc:include type="modules" name="footer" style="xhtml"/>
									</td>
									<?php if($this->countModules('right') and JRequest::getCmd('layout')!= 'form') : ?>
										<td class="greyline">&nbsp;</td>
										<td width="170">
											<jdoc:include type="modules" name="right" style="xhtml"/>
										</td>
									<?php endif; ?>
								</tr>
							</table>

						</div>
						<div class="clr"></div>
					</div>
					<div class="clr"></div>
				</div>

				<div id="whitebox_b">
					<div id="whitebox_bl">
						<div id="whitebox_br"></div>
					</div>
				</div>
			</div>
			</div>

#leftcolumn {
	padding: 0;
	margin: 0;
	width: 20%;
	float:left;
}

table.moduletable th {
    background: url("../images/mod-bg.jpg") repeat scroll 0 0 transparent;
    color: #FFFFFF;
    font-family: Verdana;
    font-size: 20px;
    font-weight: normal !important;
    height: 40px;
    padding-left: 20px;
    padding-top: 20px;
    width: 726px;
}