function get_err($this_key){
	global $err_array, $err;
	if (@array_key_exists("$this_key", $err_array)) {
		$err = "class=err";
	//	print_r($err_array);
	}else{
		$err = "";
	}	
	return $err;
}

if ($submit){
	if ($unit_price || $sold_by){
		if ($unit_price==""){
			$err_array[unit_price] = "Unit Price required if using Sold By value.";
		}elseif(!is_numeric($unit_price)){
			$err_array[unit_price] = "Unit Price must be numeric";
		}

		if ($sold_by==""){
			$err_array[sold_by] = "Sold By  required if using Unit Price value.";
		}elseif(!is_numeric($sold_by)){
			$err_array[sold_by] = "Sold By must be an integer.";
		}

		$mysum = $unit_price * $sold_by;

//		$mysum = (float)$mysum;
//		$price = (float)$price;

		$getprice = gettype($price);
		$getmysum = gettype($mysum);

		if ($price != $mysum){
			$err_array[unit_price] = "Unit Price X Sold By must = Price.<br>
				$unit_price * $sold_by = $mysum (mysum $getmysum)  = $price (price $getprice). FAILED";
			if (!array_key_exists("sold_by", $err_array)) { $err_array[sold_by] = ""; }
			if (!array_key_exists("price", $err_array)) { $err_array[price] = ""; }
		}
	}

	if (count($err_array) != 0){
		print ("<p class=err>Please correct the $err_count error(s):<br>");
		while (list($index,$value) = each($err_array)){
			print ("$value<br>");
		}
		print ("</p>");
	}else{
		print ("<p class=err>Unit Price X Sold By <b>DOES</b> = Price.<br>$unit_price * $sold_by = $mysum (mysum $getmysum)  = $price (price $getprice). WORKED!</p>");
	}
}

print ("<form action=\"$PHP_SELF\" method=\"post\">\n");
print ("<table border=0><tr><td>\n");

get_err(price);
print ("<tr $err><td>Price:</td><td><input type=\"Text\" name=\"price\" value=\"$price\" size=\"5\"></td></tr>\n");

get_err(unit_price);
print ("<tr $err><td>unit_price </td><td><input type=\"Text\" name=\"unit_price\" value=\"$unit_price\" size=5></td></tr>\n");
get_err(sold_by);
print ("<tr $err><td>sold_by </td><td><input type=\"Text\" name=\"sold_by\" value=\"$sold_by\" size=5></td></tr>\n");

print ("<tr><td colspan=2><input type=\"Submit\" name=\"submit\" value=\"DO IT DAMN YOU!\"></td></tr>\n");
print ("</form>\n");
print ("</table>\n");