Product Available From Dates Bug?

<form action="<?php echo hikashop_completeLink('product&task=updatecart'); ?>" method="post" name="hikashop_product_form" enctype="multipart/form-data">

<form action="<?php echo hikashop_completeLink('product&task=updatecart'); ?>" method="post" name="hikashop_product_form" onsubmit="return hikashop_product_form_check();" enctype="multipart/form-data">
	<script type="text/javascript">
	function hikashop_product_form_check(){
		var add_to_cart_main_div = document.getElementById('hikashop_product_quantity_main');
		if(!add_to_cart_main_div)
			return true;
		var main_div_inputs = add_to_cart_main_div.getElementsByTagName('input');
		if(!main_div_inputs.length){
			var main_div_links = add_to_cart_main_div.getElementsByTagName('a');
			if(!main_div_links.length)
				return false;
		}
		return true;
	}
	</script>