function js_include($script){ 
 var script = document.createElement('script'); 
 script.src = $js_path + $script; 
 script.type = 'text/javascript'; 
 var head = document.getElementsByTagName('head').item(0); 
 head.appendChild(script); 
} 
//题换成你的文件 
js_include("prototype.js"); 
js_include("scriptaculous.js"); 
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