css：

html,body{ margin:0px; padding:0px; height: 100%; } .headbg{ background: black; color: white; height:48px; } .userManagerAll{ height: 100%; width: 100%; } .leftside{ background: #E6E6E6; float: left; height: 100%; width: 200px; margin: 0px; overflow-y:auto; } .rightside{ background: white; height: 100%; width:100%; align:right; }

html

<div></div>

<div>

<div>1</div>

<div>2</div>

</div>

点击文本框，文字消失

<input name="textfield" type="text" value="点击文字消失" size="12" onblur="if(value=='') value='点击文字消失;"/>