function ucatch(num){
     for(var id = 1;id<=2;id++)
     {
     var testbody="test"+id;
     var p = "p"+id;
     if(id==num){
     document.getElementById(testbody).style.display="block";
     document.getElementById(p).className="p1";
     }
     else{
         document.getElementById(testbody).style.display="none";
         if(id==1){
             document.getElementById(p).className="p3";
         }else{
             document.getElementById(p).className="p2";
         }
     }
     }
     }