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var isIe=(document.all)?true:false;
try{document.execCommand('BackgroundImageCache', false, true);}catch(e){}

function $_(obj){
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}

function mouse_over_out_img(eventType, obj){//变换图片，如<img src='a_0.jpg' onmouseover="mouse_over_out_img('over', this);" onmouseout="mouse_over_out_img('out', this);">，图片必须以_0和_1规则命名
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	}
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}