/*--------------------alpha01------------------*/
#main_menu{
height:31px;
width:748px;}

#main_menu ul li{
float:left;
}

#main_menu ul li a:hover{
background:#fff;
filter: alpha(opacity=20);
opacity:0.2;
}

#main_menu ul li a{
display:block;
height:31px;
text-indent:-9999px;
text-align:left;
outline:none;
}

#main_menu01{
background:url(img/common/main_menu01.gif) no-repeat 0px 0px;
width:186px;}
#main_menu02{
background:url(img/common/main_menu02.gif) no-repeat 0px 0px;
width:188px;}
#main_menu03{
background:url(img/common/main_menu03.gif) no-repeat 0px 0px;
width:187px;}
#main_menu04{
background:url(img/common/main_menu04.gif) no-repeat 0px 0px;
width:187px;}