CONDITIONAL STATEMENT TO DETECT VIRTUEMART PAGES http://www.tips4developer.com/joomla/conditional-statement-to-detect-virtuemart-pages/
/* check if it is VirtueMart page or grabbing content using com_virtuemart*/
$option = JRequest::getString('option', null);
if ($option == 'com_virtuemart'){
}
/* check if it is VirtueMart category page*/
$view = JRequest::getString('view', null);
if ($option == 'category'){
}
/* check if it is VirtueMart product detail page*/
$view = JRequest::getString(view, null);
if ($view == 'productdetails'){
}
<?=JFactory::getApplication()->getMenu()->getActive()->alias ?>