.content_left{
position:relative;
float:left;
width:310px;
height:auto;
}

.content_right{
position:relative;
float:left;
left:15px;
width:635px;
height:auto;
}

.content_center{
position:relative;
float:left;
left:15px;
width:310px;
height:auto;
}

.content_right_2{
position:relative;
float:left;
left:30px;
width:310px;
height:auto;
}

.sub_nav{
position:relative;
text-align:left;
height:260px;
width:310px;
background:url(../images/basic/single_box.png);
}

.app_box{
text-align:left;
position:relative;
top:17px;
height:260px;
width:310px;
}