reflection 插件无法加载多个JS文件或是别的???

[raidybor]

如果这样写的话就只有最后一个CSS被加载,别的JS文件都不写,请问要怎么写才行呢,谢谢

程式碼:

function show()
	    {

		//	$str = '';
	    
            if ($this->isEnabled())
            {
                $rg = $this->blogInfo->getBlogRequestGenerator();
                
                
                $str = '<script type="text/javascript" src="' . $rg->blogLink() . '/plugins/reflightbox/class/js/prototype.js"></script>';
                $str = '<script type="text/javascript" src="' . $rg->blogLink() . '/plugins/reflightbox/class/js/lightbox.js"></script>';
                $str = '<script type="text/javascript" src="' . $rg->blogLink() . '/plugins/reflightbox/class/js/scriptaculous.js?load=effects"></script>';
                $str = '<link type="text/css" rel="stylesheet"  title="Style" href="' . $rg->blogLink() . '/plugins/reflightbox/class/css/lightbox.css" />';
             }
	    	return $str;
		}