function checkform(){
  var type = document.form1.type.value;
  //alert(type);
  if(type==0){
   alert("请选择您要登录的平台！");
   }
  else{  
   if(type==1){
    document.form1.action ="http://tod.hitce.net/login.asp";
    }
    else if(type==2){
    document.form1.action = "http://todbj.hitce.net/login.asp";
    }
   else if(type==3){
    document.form1.action = "http://todhrb.hitce.net/login.asp";
    }
   else if(type==4){
    document.form1.action = "http://todgz.hitce.net/login.asp";
   }
   else if(type==5){
    document.form1.action = "http://tod.hit.edu.cn/login.asp";
    } 

    
    //alert(document.form1.action);//
   document.form1.target="_blank";
   form1.submit();  
  }
 }