function historyGo(action){
	var now_selected = document.getElementById('history_select').selectedIndex;
	if (((now_selected + parseInt(action)) >= 0) && ((now_selected + parseInt(action)) < document.getElementById('history_select').options.length)){
		var pmeter = document.getElementById('history_select').options[now_selected + parseInt(action)].value;
		if (pmeter)
		{
			document.getElementById('history_select').value = pmeter;
			document.getElementById('history_select').selectedIndex=now_selected+parseInt(action);
			eval("doCommonLink"+pmeter.split('|')[0]+"('historyGo',pmeter.split('|')[1],pmeter.split('|')[2],pmeter.split('|')[3],pmeter.split('|')[4])");
		}else{
			alert("ไม่มีหน้าจอที่ต้องการ");
		}
	}
}

function insertOptionBefore(select_option,form_type,option_text,option_value,form_pmeters,form_tab,span_show,span_loading)
{
  var elSel = document.getElementById(select_option);
  if (history_select_buffer.length>0)
  {
	for (history_select_buffer_i=0;history_select_buffer_i< history_select_buffer.length;++history_select_buffer_i )
	{
		if (!(history_select_buffer[history_select_buffer_i][1]==elSel.options[0].value)){
		    var elOptNew = document.createElement('option');
			elOptNew.text = history_select_buffer[history_select_buffer_i][0].substr(1,100);
    		elOptNew.value = history_select_buffer[history_select_buffer_i][1];
	    	var elOptOld = elSel.options[0];  
			try {
      			elSel.add(elOptNew, elOptOld); // standards compliant; doesn't work in IE
	    	}
			catch(ex) {
      			elSel.add(elOptNew, 0); // IE only
    		}
			elSel.value=op_value;
		}
	}
	history_select_buffer=new Array();
	elSel.selectedIndex=0;
  }
  var op_value = form_type + '|' + option_text + '|' + option_value + '|' + form_pmeters + '|' + form_tab + '|' + span_show + '|' + span_loading;
if (elSel.selectedIndex >= 0) {
	if (!(op_value==elSel.options[0].value)){
	    var elOptNew = document.createElement('option');
    	elOptNew.text = option_text;
    	elOptNew.value = op_value;
    	var elOptOld = elSel.options[0];  
    	try {
      		elSel.add(elOptNew, elOptOld); // standards compliant; doesn't work in IE
    	}
    	catch(ex) {
      		elSel.add(elOptNew, 0); // IE only
    	}
		elSel.value=op_value;
	}
  }
//  alert('new link');
}

function insertOptionBeforeBuffer(select_option,form_type,option_text,option_value,form_pmeters,form_tab,span_show,span_loading)
{
//	if (!(option_text=='หน้าแรก'))
//	{
		var op_value = form_type + '|' + option_text + '|' + option_value + '|' + form_pmeters + '|' + form_tab + '|' + span_show + '|' + span_loading;
		var this_buffer=new Array(option_text,op_value);
		history_select_buffer.push(this_buffer);
//alert('re link')
//alert(auto_refresh_form_sec);

//	}
}