让input也有hover,focus

<script type="text/javascript">

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+=" iptHover";  

}  

sfEls[i].onmouseout=function() {  

this.className=this.className.replace(new RegExp(" iptHover\\b"), "");  

}  

}  

}  

sfFocus = function(sfEls) {  

for (var i=0; i < sfEls.length; i++) {  

sfEls[i].onfocus=function() {  

this.className+=" iptFocus";  

}  

sfEls[i].onblur=function() {  

this.className=this.className.replace(new RegExp(" iptFocus\\b"), "");  

}  

}  

}

</script>

<style type="text/css">

textarea{

border:1px solid #BBE1F1;

width:250px;

height:80px;

}

 .iptHover,input:hover,textarea:hover{

border:1px solid #77C2E3;

}

.iptFocus,input:focus,textarea:focus{

border:1px solid #77C2E3;

background-color:#EFF7FF;

}

</style>

<input type="text" name="textfield" /><br />

<textarea name="textarea"></textarea>

<script type="text/javascript">

suckerfish(sfHover, "input");

suckerfish(sfFocus, "input");

suckerfish(sfHover, "textarea");

suckerfish(sfFocus, "textarea");

</script>