<!--[if IE 6]><script type="text/javascript">document.execCommand("BackgroundImageCache", false, true);</script><![endif]-->

BEUI.preLoadCacheSet = function(){

//IE6默认不缓存背景图片的解决

//http://madinsect.blogbus.com/logs/29562266.html

if ( $.browser.msie ){

//alert( $.browser.version ); // 6.0

if ( $.browser.version.trim() == "6.0" ){

    //trim()在Divtpl.conroller.js定义

        document.execCommand("BackgroundImageCache", false, true);

    }

}

try{document.execCommand('BackgroundImageCache',false,true);}catch(e){}

使用zoom,display,padding等等属性来搞定