<div id="Layer4" onMouseOut="this.style.background-color='#93bee2';"  onMouseOver="this.style.background-color='#0033CC'";  style=" width:22px; height:22px;border: 0px #B1C8FF solid;"><img src="biaoqing/2009426204649332.gif" alt="表情"  width="22" height="22" onClick="MM_showHideLayers('Layer5','','show')" ></div>
可是背景没有变化，请教

<div id="Layer4" onMouseOut="this.style.backgroundColor="#93bee2";  onMouseOver="this.style.backgroundColor="#0033CC";  style=" width:22px; height:22px;border: 0px #B1C8FF solid;"><img src="biaoqing/2009426204649332.gif" alt="表情"  width="22" height="22" onClick="MM_showHideLayers('Layer5','','show')" ></div>

还是不行

<div id="Layer4" onMouseOut="this.style.backgroundColor='#93bee2'" onMouseOver="this.style.backgroundColor='#0033CC'"  style=" width:22px; height:22px; border: 0px #B1C8FF solid;"><img src="biaoqing/2009426204649332.gif" alt=" 表情"  width="22" height="22" onClick="MM_showHideLayers('Layer5','','show')" ></div>

这样就可以了，你DIV里头放了注意大小，否则即使有效果也会被遮挡住，看不见背景效果的！

<div id="Layer4" onMouseOut="this.style.backgroundColor='#93bee2'" onMouseOver="this.style.backgroundColor='#0033CC'"  style=" width:22px; height:22px;border: 1px #B1C8FF solid;"><img src="biaoqing/2009426204649332.gif" alt="表情"  width="22" height="22" onClick="MM_showHideLayers('Layer5','','show')" ></div>