<h3>Stock Initialize</h3>
<center>

<?php

$category = $_REQUEST["category"];
$subcategory = $_REQUEST["subcategory"];

if ($_POST["submit"] == 'INITIALIZE') {
	//initialize stock
	if ($subcategory) { 
		mysql_query("update st_subcategory set qty_in=0,qty_out=0,dated=now() where id=$subcategory");
		mysql_query("update st_items set qty_in=0,qty_out=0,dated=now() where category=$category and subcategory=$subcategory");
	} else {
		mysql_query("update st_category set qty_in=0,qty_out=0,dated=now() where id=$category");
		mysql_query("update st_subcategory set qty_in=0,qty_out=0,dated=now() where category=$category");
		mysql_query("update st_items set qty_in=0,qty_out=0,dated=now() where category=$category");
	}
	echo "Done";
}

echo "Select category <select name='category' onchange=\"javascript: document.location.href='?pg=$pg&category='+this.value\">
<option value=''></option>";

$rs = mysql_query("select * from st_category order by code");
while ($o = mysql_fetch_object($rs)) {
        echo "<option value='$o->id'";
        if ($o->id == $category) echo " selected";
        echo ">$o->code ($o->qty_in/$o->qty_out)</option>";
}
echo "</select>

subcategory <select name='subcategory'>
<option value=''></option>";

$rs = mysql_query("select * from st_subcategory where category=$category order by code");
while ($o = mysql_fetch_object($rs)) {
        echo "<option value='$o->id'";
        if ($o->id == $subcategory) echo " selected";
        echo ">$o->code ($o->qty_in/$o->qty_out)</option>";
}
echo "</select>

<input type='submit' name='submit' value='INITIALIZE'>";
?>

</center>