#main_img {
    background-image:url('../images_a/1.jpg');
    width:567px;
    height:356px;
    position:absolute;
}
#main_img {
    background-image:url('../images_a/1.jpg');
    width:567px;
    height:356px;
    _position:static;
}

#ajax_div {
    width:567px;
    height:356px;
}

.start_button {
    width:320px;
    height:50px;
    margin-top:275px;
    margin-left:135px;
    cursor:pointer;
    display:block;
}

.left_button {
    width:204px;
    height:50px;
    margin-top:275px;
    margin-left:50px;
    cursor:pointer;
    float:left;
    display:none;
}

.right_button {
    width:202px;
    height:50px;
    margin-top:273px;
    margin-left:47px;
    cursor:pointer;
    float:left;
    display:none;
}

/*clearfix*/
.clearfix:after {
	 content: ".";
	 display: block;
	 height: 0; clear: both;
	 visibility: hidden;
}
.clearfix {display: inline-block;}
/* Hides from IE-mac \*/
* html .clearfix {	height: 1%;}
.clearfix {display: block;}
/* End hide from IE-mac */