function aClass(Pid, Cname) {
	if (aClass.arguments.length < 2)
		alert("传入的参数错误！")

	else {
		this.Data  = Pid;
		this.Text  = Cname;
	}
}

function GetObjID(ObjName)
{ for (var ObjID=0; ObjID < document.myform.elements.length; ObjID++)
    if ( document.myform.elements[ObjID].name == ObjName )
    {  return(ObjID);
       break;
    }
  return(-1);
}

function ChangeArea(ObjName, DesName)
{
  //GET OBJECT VALUE, ID OF DESTINATION OBJECT
  ObjID    = GetObjID(ObjName);  //DptCode
  DesObjID = GetObjID(DesName);  //WorkName
  
if ( ObjID != -1 && DesObjID != -1)
  {
   document.myform.elements[DesObjID].length=0;
   document.myform.elements[DesObjID].options[0] = new Option("请选择","");
   j=1;
   for (var i=0; i<f_Set_Area.length; i++)
    {
        if ( f_Set_Area[i].Data == document.myform.elements[ObjID].value)
            {
            document.myform.elements[DesObjID].options[j] = new Option(f_Set_Area[i].Text,f_Set_Area[i].Text);
            j++
            }

    }
  }

}

var f_Set_Area = new Array(new aClass('国际航线','远洋'),
new aClass('国际航线','近海'),
new aClass('国际航线','亚洲'),
new aClass('国际航线','中国沿海'),
new aClass('国内航线','南北航线'),
new aClass('国内航线','江海联运'),
new aClass('国内航线','江河内线'),
new aClass('不限','不限'),
new aClass('亚洲','中日韩'),
new aClass('亚洲','东南亚'));