"; $r = ((isset($_GET["r"]) && is_numeric($_GET["r"]))? $_GET["r"]:1); $w = 500; $h = 500 * $r; $cx = $w/2; $cy = $h/2; $bg = ((isset($_GET["bg"]))? "#".$_GET["bg"] :"#eee"); $fg = ((isset($_GET["fg"]))? "#".$_GET["fg"] :"#000"); ?>