boyle dene
document.write('<script type="text/javascript" src="asd.js"></script>');

o calismasa bu calisir

function IncludeJavaScript(jsFile)
{
document.write('<script type="text/javascript" src="'
+ jsFile + '"></script>');
}
IncludeJavaScript('asd.js');

Bende bunlari googleden buldum