<SCRIPT LANGUAGE="JavaScript">
<!--
if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
document.writeln("<a title=\"Forum\" href=\"http:\/\/bbs.wwsafe.com\/\" ");
document.writeln("");
document.writeln("rel=\"external\"><span>安全社区<\/span><\/a>");
}else{
if (window.navigator.userAgent.indexOf("Firefox")>=1)
{
document.writeln("<a title=\"Forum\" href=\"http:\/\/bbs.wwsafe.com\/\" ");
document.writeln("");
document.writeln("rel=\"external\"><span>社区<\/span><\/a>");
}else{
document.writeln("<a title=\"Forum\" href=\"http:\/\/bbs.wwsafe.com\/\" ");
document.writeln("");  
document.writeln("rel=\"external\"><span>安全社区<\/span><\/a>");
}
}
//-->
</SCRIPT>

代码意思:
如果是IE就显示‘安全社区’ 
 如果是firefox就显示‘ 社区’ 
    都不是这两个的话 显示 ‘安全社区’

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