public function validate_field($field, $fieldset) {

		global $db;
		$caption = $field["caption"];
		$type = $field["type"];
		$error = $field["error_message"];
		$error2 = $field["error_message2"];
		$validation_type = $field["validation_type"];
		$min = $field["min"];
		$max = $field["max"];
		$required = $field["required"];
		$unique = $field["unique"];
		$editable = $field["editable"];
		$extensions = $field["extensions"];
		$max_uploaded_size = $field["max_uploaded_size"] * 1000;
		$image_resize = $field["image_resize"];
		$date_format = $field["date_format"];
		if ($field["is_numeric"] && !$validation_type)
		{
			$validation_type = "numeric";
		}
		$set = 0;
		$val = "";
		switch ($type)
		{
			case "depending":
			{
				$no_fields = $field["depending"]["no"];
				$nf = 1;
				while ($nf <= $no_fields)
				{
					$caption = $field["depending"]["caption" . $nf];
					$required = $field["depending"]["required" . $nf];
					if ($required == 1 && (!(!isset($_POST[$caption])) && !$_POST[$caption]))
					{
						$err = 1;
						$this->addError($caption, $field["depending"]["error_message" . $nf]);
					}
					if (isset($_POST[$caption]))
					{
						if ($field["other_val"] && $_POST[$caption] == "-1")
						{
							$this->tmp[$caption] = cleanStr($_POST[$caption . "_other_val"]);
						}
						 else
						{
							$this->tmp[$caption] = cleanStr($_POST[$caption]);
						}
					}
					$nf++;
					continue;
				}
				$this->tmp["dep_id"] = $field["depending"]["id"];
				$set = 1;
				return null;
			}
			case "checkbox":
			{
				$val = checkbox_value($caption);
				$set = 1;
				break;
			}
			case "checkbox_group":
			{
				$elements = explode("|", trim($field["elements"]));
				$val = array();
				$k = 0;
				$n = 0;
				foreach ($elements as $el)
				{
					$el = trim($el);
					$check_caption = $caption . "_" . $n;
					if (isset($_POST[$check_caption]) && $_POST[$check_caption] == "on")
					{
						$val[$k] = $el;
						$k++;
					}
					$n++;
					continue;
				}
				$set = 1;
				break;
			}
			case "multiselect":
			{
				$val = array();
				$k = 0;
				while (isset($_POST[$caption][$k]) || ($f = $_POST[$caption][$k]))
				{
					$val[$k] = $f;
					$k++;
					continue;
				}
				$set = 1;
				break;
			}
			case "file":
			{
				if (isset($_FILES[$caption]["name"]))
				{
					$val = $_FILES[$caption]["name"];
				}
				 else
				{
					$val = "";
				}
				$validation_type = "file";
				$set = 1;
				break;
			}
			case "image":
			{
				if (isset($_FILES[$caption]["name"]))
				{
					$val = $_FILES[$caption]["name"];
				}
				 else
				{
					$val = "";
				}
				$validation_type = "image";
				$set = 1;
				break;
			}
			case "youtube":
			{
				$validation_type = "youtube";
				if (isset($_POST[$caption]))
				{
					$val = cleanStr($_POST[$caption]);
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