Magento how to remove minimum quantity allowed for purchase validation error

Just comment the line below: (Lines from #499 to #505)
/public_html/app/code/core/Mage/CatalogInventory/Model/Stock/Item.php

if ($this->getMinSaleQty() && ($qty) getMinSaleQty()) {
            $result->setHasError(true)
                ->setMessage(Mage::helper('cataloginventory')->__('The minimum quantity allowed for purchase is %s.', $this->getMinSaleQty() * 1))
                ->setQuoteMessage(Mage::helper('cataloginventory')->__('Some of the products cannot be ordered in requested quantity.'))
                ->setQuoteMessageIndex('qty');
            return $result;
        }

URL Validation

If you want to validate an URL in input fields, here is the JS code:

function isUrl(s) {
var regexp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
return regexp.test(s);
}