{浏览器兼容}解决IE7以下版本不支持无A状态伪类的几种方法！

function suckerfish(type, tag, parentId) {
if (window.attachEvent) {
window.attachEvent("onload", function() {
var sfEls = (parentId==null)?document.getElementsByTagName(tag):document.getElementById(parentId).getElementsByTagName(tag);
type(sfEls);
});
}
}
sfHover = function(sfEls) {
for (var i=0; i < sfEls.length; i ) {
sfEls[i].onmouseover=function() {
this.className =" sfhover";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
}
}
}
sfFocus = function(sfEls) {
for (var i=0; i < sfEls.length; i ) {
sfEls[i].onfocus=function() {
this.className =" sffocus";
}
sfEls[i].onblur=function() {
this.className=this.className.replace(new RegExp(" sffocus\\b"), "");
}
}
}
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");

//这里写入你需要效果的标签
suckerfish(sfHover, "INPUT");
suckerfish(sfFocus, "INPUT");
suckerfish(sfHover, "p");

input:focus,input.sffocus {
background: #F8F8F8;
color: #333333;
border: 1px solid red;
}
input:hover,input.sfhover{
background: #EEE;
color: #369;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
border: 1px solid #069;
}
p:hover,p.sfhover{
background: #EEE;
color: #333;
}

var W3CDOM = (document.createElement && document.getElementsByTagName);
//window.onload = pinballEffect;
function pinballEffect()
{
if (!W3CDOM) return;
var allElements = document.getElementsByTagName('*');
var originalBackgrounds=new Array();
for (var i=0; i < allElements.length; i )
{
if (allElements[i].className.indexOf('hovereffect') !=-1)
{
allElements[i].onmouseover = mouseGoesOver;
allElements[i].onmouseout = mouseGoesOut;
}
}
}
function mouseGoesOver()
{
originalClassNameString = this.className;
this.className = " lay-on";
}
function mouseGoesOut()
{
this.className = originalClassNameString;
}
pinballEffect();

if (allElements[i].className.indexOf('hovereffect') !=-1)

.hovereffect{
Background: #CCC;
}