#per_left {
  float: left;
  width: 2%;
  height: 100%;
  margin: 0px 0px 0px 0px;
  height:100%;
}
#left_menu {
  float: left;
  width: 15%;
  height: 100%;
  margin: 10px 0px 0px 0px;
  height:100%;
}
#per {
  float: left;
  width: 5%;
  height: 100%;
  margin: 0px 0px 0px 0px;
  height:100%;
}
#my_content {
  float: left;
  width: 75%;  
  margin:10px 0px 50px 0px;
  background-color: #fff;
  height:100%;
} 
.cm_helpsubtitle {font-size:82%;margin-left:10px; margin-bottom:2px;margin-right:20px }
.left_title{margin:10px 5px 10px;overflow:hidden;zoom:1}