Ie7-js: Maybe you don't need to think about IE5-8 browsers, ie7-jsie5
1. What is ie7-js?
Ie7-js is really a good project, the project URL is http://code.google.com/p/ie7-js/, if the wall can be opened with a Web page proxy. Ie7-js is a JS library that allows earlier versions of IE browsers to behave like modern browsers, such as making IE5-6 support for transparent PNG images. Ie7-js projects include ie7.js, ie8.js and ie9.js, just called ie7-js because this project is started from ie7.js.
Ii. How to introduce
If you want your IE5-6 to behave like IE7, introduce ie7.js:
<span style="font-size:14px;"><!--[if lt IE 7]><script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE7.js"></script><![endif]--></span>
If you want your IE5-7 to behave like IE7, introduce ie8.js:
<span style="font-size:14px;"><!--[if lt IE 8]><script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE8.js"></script><![endif]--></span>
If you want your IE5-8 to behave like IE7, introduce ie9.js:
<span style="font-size:14px;"><!--[if lt IE 9]><script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE9.js"></script><![endif]--></span>
If ie9.js is introduced, you no longer need to introduce ie7/8. js.