I think that you see the decimals after saving a product at the admin interface. If i am right i have a tested solution for you.
Please open /administrator/components/com_virtuemart/html/product.product_display.php file for editing and replace the code from 153rd line to 167th with this one

PHP Code:

    <fieldset>
        <legend><strong><?php echo $dim_weight_label ?></strong></legend>
          
        <div class="formLabel"> <?php echo $VM_LANG->_PHPSHOP_PRODUCT_FORM_LENGTH ?>:</div>
        <div class="formField" > <?php echo round($db->f("product_length"),0) . " " . $db->f("product_lwh_uom"); ?></div>
      
        <div class="formLabel"> <?php echo $VM_LANG->_PHPSHOP_PRODUCT_FORM_WIDTH ?>:</div>
        <div class="formField" > <?php echo round($db->f("product_width"),0) . " " . $db->f("product_lwh_uom"); ?></div>
      
        <div class="formLabel"> <?php echo $VM_LANG->_PHPSHOP_PRODUCT_FORM_HEIGHT ?>:</div>
        <div class="formField"> <?php echo round($db->f("product_height"),0) . " " . $db->f("product_lwh_uom"); ?></div>
        
        <div class="formLabel"> <?php echo $VM_LANG->_PHPSHOP_PRODUCT_FORM_WEIGHT ?>:</div>
        <div class="formField"><?php echo round($db->f("product_weight"),1) . " " . $db->f("product_weight_uom"); ?></div>
    </fieldset>

mate

you have javascript errors and that's gonna put people off.

it seems you use mootools (EXCELLENT CHOICE! ) / slimbox but you've also added some pngfix shite that's not very compatible

*edit* checked boss cart, it seems that it is provided alongside of the distribution of the software, nice!

to bosscart devs:
mootools 1.2 came out a while back and it is simply amazing

anyway:

http://www.propokerden.com/templates/js/iepng.js

this:

Code:

window.attachEvent is not a function
http://www.propokerden.com/templates/js/iepng.js
Line 32

32: window.attachEvent("onload", correctPNG);

when mootools is being used, the window. is redefined/extened and events are added differently. rewrite this to:

window.addEvent("domready", correctPNG);

or even better,
window.addEvent("domready, function() {
correctPNG();
// you can do other stuff on domready, for example, to avoid using http://www.propokerden.com/templates/js/top.js:
new Element("a").injectTop(document.body).setProperty( "name", "top");
});

but really, you may want to look at unification of all your code to adhere to the same standards/namespaces

here is a mootools compliant fix, provided by cnet's clientside: FixPNG » CNET Javascript Documentation

in an ideal world, if you can do without png alpha channels, go with gif