behaviour when changing variant

if (!empty ($variant->images)) {
?>
			<div id="hikashop_product_image_<?php echo $variant_name;?>" style="display:none;">
				<div id="hikashop_main_image_div_<?php echo $variant_name;?>" class="hikashop_main_image_div">
				<?php

				$image = reset($variant->images);
				$height = $this->config->get('product_image_y',$this->config->get('thumbnail_y'));
				$width = $this->config->get('product_image_x',$this->config->get('thumbnail_x'));
				if (!$this->config->get('thumbnail')) {
					echo '<img src="' . $this->image->uploadFolder_url . $image->file_path . '" alt="' . $image->file_name . '" id="hikashop_main_image_' . $variant_name . '" style="margin-top:10px;margin-bottom:10px;display:inline-block;vertical-align:middle" />';
				} else {
					$style = '';
					if (count($variant->images) > 1) {
						if (!empty ($height)) {
							$style = ' style="height:' . ($height +5) . 'px;"';
						}
					}
?>
						<div class="hikashop_product_main_image_thumb" id="hikashop_main_image_thumb_div_<?php echo $variant_name;?>" <?php echo $style;?>>
						<?php echo $this->image->display($image->file_path,true,$image->file_name,'id="hikashop_main_image_'.$variant_name.'" style="margin-top:10px;margin-bottom:10px;display:inline-block;vertical-align:middle"','id="hikashop_main_image_'.$variant_name.'_link"', $width,  $height); ?>
						</div>
					<?php

				}
				if (count($variant->images) > 1) {
?>
					</div><div id="hikashop_small_image_div_<?php echo $variant_name;?>" class="hikashop_small_image_div"><?php

					foreach ($variant->images as $image) {
						echo $this->image->display($image->file_path, 'hikashop_main_image_' . $variant_name, $image->file_name, 'class="hikashop_child_image"','', $width,  $height);
					}
				}
?>
				</div>
			</div>
			<?php  }

<div id="hikashop_product_contact_<?php echo $variant_name;?>" style="display:none;">
			<?php

				if (hikashop_level(1) && ($contact == 2 || ($contact == 1 && !empty ($this->element->product_contact)))) {
					echo $this->cart->displayButton(JText :: _('CONTACT_US_FOR_INFO'), 'contact_us', @ $this->params, hikashop_completeLink('product&task=contact&cid=' . $variant->product_id), 'window.location=\'' . hikashop_completeLink('product&task=contact&cid=' . $variant->product_id) . '\';return false;');
				}
?>
			</div>