if($view == 'item' || !$this->countModules('right')) {
	$mainClass = 'jf-grid-12';
} else {
	$mainClass = 'jf-grid-9';
}
 

 
if(!$this->countModules('right')) {
	$mainClass = 'jf-grid-12';
} else {
	$mainClass = 'jf-grid-9';
}
 

 
<?php if($this->countModules('right') && $view != 'item') : ?>
<div id="jf-sidebar" class="jf-grid-3">
	...
</div>
<?php endif; ?>
 

 
<?php if($this->countModules('right')) : ?>
<div id="jf-sidebar" class="jf-grid-3">
	...
</div>
<?php endif; ?>