You can try below code for link to product view page.
I have check your structure. When you hover the Image then one layer will be coming so we need to give url to that link.
<div class="product-inner" onClick="window.open('<?php echo $_product->getProductUrl() ?>');">
<h2 class="product-name"><a href="<?php echo $_product->getProductUrl() ?>" title="<?php echo $this->stripTags($_product->getName(), null, true) ?>"><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></a></h2>
<?php if($_product->getRatingSummary()): ?>
<?php echo $this->getReviewsSummaryHtml($_product, 'short') ?>
<?php endif; ?>
<div class="product-des">
<?php echo $_helper->productAttribute($_product, $_product->getShortDescriptionGrid(), 'short_description_grid') ?>
</div>
<div class="actions">
<ul class="add-to-links">
<?php if($_product->isSaleable()): ?>
<?php else: ?>
<li><p class="availability out-of-stock"><span><?php echo $this->__('Out of stock') ?></span></p></li>
<?php endif; ?>
</ul>
<div class="price-box-item">
</div>
More Focus on line no one <div class="product-inner" onClick="window.open('<?php echo $_product->getProductUrl() ?>');">
.