function changeStyle(obj){
if(obj == "op_1"){
    document.getElementById("op_1").className = "active";
    document.getElementById("op_2").className = "";
    document.getElementById("op_3").className = "";
    document.getElementById("op_4").className = "";
	document.getElementById("op_5").className = "";
    }
if(obj == "op_2"){
    document.getElementById("op_2").className = "active";
    document.getElementById("op_1").className = "";
    document.getElementById("op_3").className = "";
    document.getElementById("op_4").className = "";
	document.getElementById("op_5").className = "";
    }
if(obj == "op_3"){
    document.getElementById("op_3").className = "active";
    document.getElementById("op_1").className = "";
    document.getElementById("op_2").className = "";
    document.getElementById("op_4").className = "";
	document.getElementById("op_5").className = "";
    }

if(obj == "op_4"){
    document.getElementById("op_4").className = "active";
    document.getElementById("op_1").className = "";
    document.getElementById("op_2").className = "";
    document.getElementById("op_3").className = "";
	document.getElementById("op_5").className = "";
    }
if(obj == "op_5"){
    document.getElementById("op_5").className = "active";
    document.getElementById("op_1").className = "";
    document.getElementById("op_2").className = "";
    document.getElementById("op_3").className = "";
	document.getElementById("op_4").className = "";
    }
  }
function changeStyle_3(obj){
  if(obj == "part_1"){
    document.getElementById("part_1").className = "article";
    document.getElementById("part_2").className = "yincang";
    document.getElementById("part_3").className = "yincang";
    document.getElementById("part_4").className = "yincang";
	document.getElementById("part_5").className = "yincang";
    }
if(obj == "part_2"){
    document.getElementById("part_2").className = "article";
    document.getElementById("part_1").className = "yincang";
    document.getElementById("part_3").className = "yincang";
    document.getElementById("part_4").className = "yincang";
	document.getElementById("part_5").className = "yincang";
    }
if(obj == "part_3"){
    document.getElementById("part_3").className = "article";
    document.getElementById("part_1").className = "yincang";
    document.getElementById("part_2").className = "yincang";
    document.getElementById("part_4").className = "yincang";
	document.getElementById("part_5").className = "yincang";
    }

if(obj == "part_4"){
    document.getElementById("part_4").className = "article";
    document.getElementById("part_1").className = "yincang";
    document.getElementById("part_2").className = "yincang";
    document.getElementById("part_3").className = "yincang";
	document.getElementById("part_5").className = "yincang";
    }
if(obj == "part_5"){
    document.getElementById("part_5").className = "article";
    document.getElementById("part_1").className = "yincang";
    document.getElementById("part_2").className = "yincang";
    document.getElementById("part_3").className = "yincang";
	document.getElementById("part_4").className = "yincang";
    }
  }