function returnDocument() {
    var file_name = document.location.href;
    var end = (file_name.indexOf("?") == -1) ? file_name.length : file_name.indexOf("?");
    return file_name.substring(file_name.lastIndexOf("/")+1, end);
  }
  
  var file = returnDocument();
	if (file == '') { file = 'index.i' }
  var name = file.split(".");
  var text = name[0].replace("_", " ");
  
  if (name[0] == 'aircraft_listing'){
  	var idtype = 'alid';
  } else if (name[0] == 'vendor_listing'){
  	var idtype = 'vlid';
  } else if (name[0] == 'aircraft'){
  	var idtype = 'acid';
  } else if (name[0] == 'manufacturer'){
  	var idtype = 'manid';
  } else if (name[0] == 'propeller'){
  	var idtype = 'propid';
  } else if (name[0] == 'power_plant'){
  	var idtype = 'ppid';
  } else if (name[0] == 'customer'){
  	var idtype = 'custid';
  } else if (name[0] == 'index'){
	  var idtype = 'alid';
	}
 
  function htmlmod(){
    var test_desc = cur_sort.match("desc");
    if(test_desc == 'desc'){
      var justname = cur_sort.split(" ");
      document.getElementById('h_'+ justname[0]).innerHTML += '<font color="#2588aa"> &and;</font>';
    } else {
      var justname = cur_sort.split(" ");
      document.getElementById('h_'+ justname[0]).innerHTML += '<font color="#2588aa"> &or;</font>';
    }
  }
  function sort(type){
    if(cur_sort == type){
      if(keyword == ''){
        window.location = file +'?sort='+ type +' desc';
      } else {
        window.location = file +'?keyword='+ keyword +'&sort='+ type +' desc';
      }
    } else {
      if(keyword == ''){
        window.location = file +'?sort='+ type;
      } else {
        window.location = file +'?keyword='+ keyword +'&sort='+ type;
      }
    }
  }