Order Sub-Categories under Parent

How will i be able to order my sub-categories under my parent?

Right now they show up as:

-Parent 1
-Parent 2
-Parent 3
-Parent 4
---Sub-Categories of 1
---Sub-Categories of 2
---Sub-Categories of 3
---Sub-Categories of 4

My code is:

    $cat.='<select size="1" name="category" size="36" maxlength="255">';
    $cat.='<OPTION VALUE="___" selected>Select A Category</OPTION>';
    $sql_query_cat = "SELECT * FROM categories ORDER BY parent ASC";
    //store the SQL query in the result variable
    $result_cat = mysql_query($sql_query_cat);
    if(mysql_num_rows($result_cat))
    {
    //output as long as there are still available fields
    while($row = mysql_fetch_array($result_cat))
    {
	 $parent = stripslashes($row[parent]);
	 $categ = $row[title];
     $categ = stripslashes($categ);
	 if($parent=='0'){
	$cat.='<option>-'.$categ.'</option>';
 }else{
 	$cat.='<option>---'.$categ.'</option>';
	}
    }
	}
    $cat.='</select>';

PHP:

The table contains 'id', 'title', 'parent'

 

This function should do the trick:

function build_category_tree( $id, $level, $defaultID)
{
$printme = "";
$categories = mysql_query("SELECT * FROM categories WHERE PARENT = $id ORDER BY name");
if(count($categories) < 1) { return $printme; }
while ($category = mysql_fetch_object($categories) )
	{
	if($id == 0) { $printme .= "<option>---------------------------</option>\n"; }
	$printme .= "<option value=\"" . $category->id . "\"";
	if($defaultID == $category->id) { $printme .= " selected=\"selected\""; }
	$printme .= " \">";
	$printme .= str_repeat(" &gt; ", $level) .  $category->name . "</option>\n";
	$printme .= build_category_tree( $category->id, $level + 1, $defaultID);
	}

return $printme;
}

Code (markup):