#area-all-l {
	width:100%;
}

#area-all-l #sidemenu {
	float:left;
	width:25%;
	background-color: #eaeaea;
}
#area-all-l #sidemenu ul { /* sidemenu setting */
    padding:10px;
    margin:0;
    list-style-type:none;
}
#area-all-l #sidemenu ul li a {
    text-decoration:none;
}

#area-all-l #mainbox {
	float:left;
	width:75%;
}
* html #area-all-l #mainbox { /* IE6 */
	width:74%;
}
*:first-child+html #area-all-l #mainbox { /* IE7 */
	width:74%;
}