разные css файлы ДНЁМ И НОЧЬЮ

if (strpos ( $this->template, "[aviable=" ) !== false) {
            $this->template = preg_replace_callback ( "#\\[(aviable)=(.+?)\\](.*?)\\[/aviable\\]#is", array( &$this, 'check_module'), $this->template );
        }

if (strpos ( $this->template, "[time" ) !== false) {
            $this->template = preg_replace_callback ( "#\\[time([>!<=]+)([\d]+)\\](.*?)\\[/time\\]#is", array( &$this, 'time_block'), $this->template );
      }

function check_module( $matches=array() ) {

function time_block( $matches=array() ) {
        $_TIME = $this->_TIME;
                
        $time = $matches[2];
        $block = $matches[3];
        
        $time_now = date("H", $_TIME);

        eval("if( $time_now ".$matches[1]." $time ) \$result = \$block;");
        return $result;
                
      }

 <script type="text/javascript">
<!--
function change(css)
{document.write('<link href=\"\/templates\/ser-size\/style\/styles'+css+'.css\" rel=\"stylesheet\"');}
var h=(new Date()).getHours();
if (h > 23 || h <4) change('_night');//ночь
if (h > 5 || h <24) change('_day');//день

//-->
</script>