当文本框获取焦点时，改变背景色（可在样式表中引用：input,textarea { behavior:url(/css/***.htc); })

<!-- 
/*==================================/
*与样式textBox绑定的行为文件

*
*功能：
* 实现当用户的光标定位在某输入框时，
* 该输入框显示不同的颜色的动态效果

===================================*/
-->
<public:attach event="onfocus" onevent="doFocus()"/>
<public:attach event="onblur" onevent="doBlur()"/>

<script language="jscript">
function doFocus()
{
if(element.tagName != 'INPUT' && element.tagName != 'TEXTAREA') 
return false;
if(element.tagName == 'INPUT' && (element.type == "submit" || element.type == "button" ))
return false;

if(!element.readOnly)
{
element.style.backgroundColor = '#E0FFFF';
}
}

function doBlur()
{
if(element.tagName != 'INPUT' && element.tagName != 'TEXTAREA') 
return false;
if(element.tagName == 'INPUT' && (element.type == "submit" || element.type == "button" ))
return false;

element.style.backgroundColor = '#FFFFFF';
}

//取cookie的内容
function getCookieVal (offset) 
{
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1)
        endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}

//获取指定cookie的值
function getCookie (name) 
{
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) 
    {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg)
            return getCookieVal (j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return null;
}



</script>