function check_search_form()
{
	if (document.search_form.zip.value == '')
	{
		alert("Please enter a zip code into the form.");
		document.search_form.zip.focus();
    	return false;
	}
	
	//if (document.search_form.category.value == '0')
	//{
	//	alert("Please select a category.");
	//	document.search_form.category.focus();
    //	return false;
	//}
	
	//if (document.search_form.subcategory.value == '0')
	//{
	//	alert("Please select a subcategory.");
	//	document.search_form.subcategory.focus();
    //	return false;
	//}

    return true;
}