<!doctype html>
<html>
<head>
<meta charset="gb2312" />
<style>
</style>
</head>
<body>
<input id="test" type="text" value="默认" style="color:#999;" />
<script>
function $(o){return document.getElementById(o)}
$('test').onfocus = function(){
if( this.value == this.defaultValue ){
this.value = '';
this.style.color = '#000';
}
}
$('test').onblur = function(){
if( this.value == '' || this.value == this.defaultValue ){
this.value = this.defaultValue;
this.style.color = '#999';
}
}
</script>
</body>
</html>
